{"id":1794,"date":"2018-10-23T14:51:42","date_gmt":"2018-10-23T06:51:42","guid":{"rendered":"https:\/\/yanjingang.com\/blog\/?p=1794"},"modified":"2018-12-17T20:17:39","modified_gmt":"2018-12-17T12:17:39","slug":"%e6%b7%b1%e5%85%a5%e7%90%86%e8%a7%a3php7%e5%86%85%e6%a0%b8%e4%b9%8bzval","status":"publish","type":"post","link":"https:\/\/yanjingang.com\/blog\/?p=1794","title":{"rendered":"\u6df1\u5165\u7406\u89e3PHP7\u5185\u6838\u4e4bzval"},"content":{"rendered":"<div class=\"copyright\">\n<ul>\n<li>\u672c\u6587\u5730\u5740:\u00a0<a title=\"Permanet Link to \u6df1\u5165\u7406\u89e3PHP7\u5185\u6838\u4e4bzval\" href=\"http:\/\/www.laruence.com\/2018\/04\/08\/3170.html\">http:\/\/www.laruence.com\/2018\/04\/08\/3170.html<\/a><\/li>\n<li>\u8f6c\u8f7d\u8bf7\u6ce8\u660e\u51fa\u5904<\/li>\n<\/ul>\n<\/div>\n<p>PHP7\u5df2\u7ecf\u53d1\u5e03, \u5982\u627f\u8bfa, \u6211\u4e5f\u8981\u5f00\u59cb\u8fd9\u4e2a\u7cfb\u5217\u7684\u6587\u7ae0\u7684\u7f16\u5199, \u4e3b\u8981\u60f3\u901a\u8fc7\u6587\u7ae0\u8ba9\u5927\u5bb6\u7406\u89e3\u5230PHP7\u7684\u5de8\u5927\u6027\u80fd\u63d0\u5347\u80cc\u540e\u5230\u5e95\u6211\u4eec\u505a\u4e86\u4ec0\u4e48, \u4eca\u5929\u6211\u60f3\u5148\u548c\u5927\u5bb6\u804a\u804azval\u7684\u53d8\u5316. \u5728\u8bb2zval\u53d8\u5316\u7684\u4e4b\u524d\u6211\u4eec\u5148\u6765\u770b\u770bzval\u5728PHP5\u4e0b\u9762\u662f\u4ec0\u4e48\u6837\u5b50<\/p>\n<h3>zval\u56de\u987e<\/h3>\n<p>\u5728PHP5\u7684\u65f6\u5019, zval\u7684\u5b9a\u4e49\u5982\u4e0b:<\/p>\n<ol>\n<li><span class=\"sh_keyword\">struct<\/span> <span class=\"sh_classname\">_zval_struct<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_keyword\">union<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_type\">long<\/span> lval<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_type\">double<\/span> dval<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_keyword\">struct<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_type\">char<\/span> <span class=\"sh_symbol\">*<\/span>val<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_type\">int<\/span> len<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_cbracket\">}<\/span> str<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">HashTable<\/span> <span class=\"sh_symbol\">*<\/span>ht<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_object_value<\/span> obj<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_ast<\/span> <span class=\"sh_symbol\">*<\/span>ast<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_cbracket\">}<\/span> value<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_uint<\/span> refcount__gc<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_uchar<\/span> type<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_uchar<\/span> is_ref__gc<span class=\"sh_symbol\">;<\/span><\/li>\n<li><span class=\"sh_cbracket\">}<\/span><span class=\"sh_symbol\">;<\/span><\/li>\n<\/ol>\n<p>\u5bf9PHP5\u5185\u6838\u6709\u4e86\u89e3\u7684\u540c\u5b66\u5e94\u8be5\u5bf9\u8fd9\u4e2a\u7ed3\u6784\u6bd4\u8f83\u719f\u6089, \u56e0\u4e3azval\u53ef\u4ee5\u8868\u793a\u4e00\u5207PHP\u4e2d\u7684\u6570\u636e\u7c7b\u578b, \u6240\u4ee5\u5b83\u5305\u542b\u4e86\u4e00\u4e2atype\u5b57\u6bb5, \u8868\u793a\u8fd9\u4e2azval\u5b58\u50a8\u7684\u662f\u4ec0\u4e48\u7c7b\u578b\u7684\u503c, \u5e38\u89c1\u7684\u53ef\u80fd\u9009\u9879\u662fIS_NULL, IS_LONG, IS_STRING, IS_ARRAY, IS_OBJECT\u7b49\u7b49.<\/p>\n<p>\u6839\u636etype\u5b57\u6bb5\u7684\u503c\u4e0d\u540c, \u6211\u4eec\u5c31\u8981\u7528\u4e0d\u540c\u7684\u65b9\u5f0f\u89e3\u8bfbvalue\u7684\u503c, \u8fd9\u4e2avalue\u662f\u4e2a\u8054\u5408\u4f53, \u6bd4\u5982\u5bf9\u4e8etype\u662fIS_STRING, \u90a3\u4e48\u6211\u4eec\u5e94\u8be5\u7528value.str\u6765\u89e3\u8bfbzval.value\u5b57\u6bb5, \u800c\u5982\u679ctype\u662fIS_LONG, \u90a3\u4e48\u6211\u4eec\u5c31\u8981\u7528value.lval\u6765\u89e3\u8bfb.<\/p>\n<p>\u53e6\u5916, \u6211\u4eec\u77e5\u9053PHP\u662f\u7528\u5f15\u7528\u8ba1\u6570\u6765\u505a\u57fa\u672c\u7684\u5783\u573e\u56de\u6536\u7684, \u6240\u4ee5zval\u4e2d\u6709\u4e00\u4e2arefcount__gc\u5b57\u6bb5, \u8868\u793a\u8fd9\u4e2azval\u7684\u5f15\u7528\u6570\u76ee, \u4f46\u8fd9\u91cc\u6709\u4e00\u4e2a\u8981\u8bf4\u660e\u7684, \u57285.3\u4ee5\u524d, \u8fd9\u4e2a\u5b57\u6bb5\u7684\u540d\u5b57\u8fd8\u53eb\u505arefcount, 5.3\u4ee5\u540e, \u5728\u5f15\u5165\u65b0\u7684\u5783\u573e\u56de\u6536\u7b97\u6cd5\u6765\u5bf9\u4ed8\u5faa\u73af\u5f15\u7528\u8ba1\u6570\u7684\u65f6\u5019, \u4f5c\u8005\u52a0\u5165\u4e86\u5927\u91cf\u7684\u5b8f\u6765\u64cd\u4f5crefcount, \u4e3a\u4e86\u80fd\u8ba9\u9519\u8bef\u66f4\u5feb\u7684\u663e\u73b0, \u6240\u4ee5\u6539\u540d\u4e3arefcount__gc, \u8feb\u4f7f\u5927\u5bb6\u90fd\u4f7f\u7528\u5b8f\u6765\u64cd\u4f5crefcount.<\/p>\n<p>\u7c7b\u4f3c\u7684, \u8fd8\u6709is_ref, \u8fd9\u4e2a\u503c\u8868\u793a\u4e86PHP\u4e2d\u7684\u4e00\u4e2a\u7c7b\u578b\u662f\u5426\u662f\u5f15\u7528, \u8fd9\u91cc\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u662f\u4e0d\u662f\u5f15\u7528\u662f\u4e00\u4e2a\u6807\u5fd7\u4f4d.<\/p>\n<p>\u8fd9\u5c31\u662fPHP5\u65f6\u4ee3\u7684zval, \u57282013\u5e74\u6211\u4eec\u505aPHP5\u7684opcache JIT\u7684\u65f6\u5019, \u56e0\u4e3aJIT\u5728\u5b9e\u9645\u9879\u76ee\u4e2d\u8868\u73b0\u4e0d\u4f73, \u6211\u4eec\u8f6c\u800c\u610f\u8bc6\u5230\u8fd9\u4e2a\u7ed3\u6784\u4f53\u7684\u5f88\u591a\u95ee\u9898. \u800cPHPNG\u9879\u76ee\u5c31\u662f\u4ece\u6539\u5199\u8fd9\u4e2a\u7ed3\u6784\u4f53\u800c\u5f00\u59cb\u7684.<\/p>\n<h3>\u5b58\u5728\u7684\u95ee\u9898<\/h3>\n<p>PHP5\u7684zval\u5b9a\u4e49\u662f\u968f\u7740Zend Engine 2\u8bde\u751f\u7684, \u968f\u7740\u65f6\u95f4\u7684\u63a8\u79fb, \u5f53\u65f6\u8bbe\u8ba1\u7684\u5c40\u9650\u6027\u4e5f\u8d8a\u6765\u8d8a\u660e\u663e:<\/p>\n<p>\u9996\u5148\u8fd9\u4e2a\u7ed3\u6784\u4f53\u7684\u5927\u5c0f\u662f(\u572864\u4f4d\u7cfb\u7edf)24\u4e2a\u5b57\u8282, \u6211\u4eec\u4ed4\u7ec6\u770b\u8fd9\u4e2azval.value\u8054\u5408\u4f53, \u5176\u4e2dzend_object_value\u662f\u6700\u5927\u7684\u957f\u677f, \u5b83\u5bfc\u81f4\u6574\u4e2avalue\u9700\u898116\u4e2a\u5b57\u8282, \u8fd9\u4e2a\u5e94\u8be5\u662f\u5f88\u5bb9\u6613\u53ef\u4ee5\u4f18\u5316\u6389\u7684, \u6bd4\u5982\u628a\u5b83\u632a\u51fa\u6765, \u7528\u4e2a\u6307\u9488\u4ee3\u66ff,\u56e0\u4e3a\u6bd5\u7adfIS_OBJECT\u4e5f\u4e0d\u662f\u6700\u6700\u5e38\u7528\u7684\u7c7b\u578b.<\/p>\n<p>\u7b2c\u4e8c, \u8fd9\u4e2a\u7ed3\u6784\u4f53\u7684\u6bcf\u4e00\u4e2a\u5b57\u6bb5\u90fd\u6709\u660e\u786e\u7684\u542b\u4e49\u5b9a\u4e49, \u6ca1\u6709\u9884\u7559\u4efb\u4f55\u7684\u81ea\u5b9a\u4e49\u5b57\u6bb5, \u5bfc\u81f4\u5728PHP5\u65f6\u4ee3\u505a\u5f88\u591a\u7684\u4f18\u5316\u7684\u65f6\u5019, \u9700\u8981\u5b58\u50a8\u4e00\u4e9b\u548czval\u76f8\u5173\u7684\u4fe1\u606f\u7684\u65f6\u5019, \u4e0d\u5f97\u4e0d\u91c7\u7528\u5176\u4ed6\u7ed3\u6784\u4f53\u6620\u5c04, \u6216\u8005\u5916\u90e8\u5305\u88c5\u540e\u6253\u8865\u4e01\u7684\u65b9\u5f0f\u6765\u6269\u5145zval, \u6bd4\u59825.3\u7684\u65f6\u5019\u65b0\u5f15\u5165\u4e13\u95e8\u89e3\u51b3\u5faa\u73af\u5f15\u7528\u7684GC, \u5b83\u4e0d\u5f97\u91c7\u7528\u5982\u4e0b\u7684\u6bd4\u8f83hack\u7684\u505a\u6cd5:<\/p>\n<ol>\n<li><span class=\"sh_comment\">\/* The following macroses override macroses from zend_alloc.h *\/<\/span><\/li>\n<li><span class=\"sh_preproc\">#undef<\/span> ALLOC_ZVAL<\/li>\n<li><span class=\"sh_preproc\">#define<\/span> <span class=\"sh_function\">ALLOC_ZVAL<\/span><span class=\"sh_symbol\">(<\/span>z<span class=\"sh_symbol\">)<\/span> <span class=\"sh_symbol\">\\<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_keyword\">do<\/span> <span class=\"sh_cbracket\">{<\/span> <span class=\"sh_symbol\">\\<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_symbol\">(<\/span>z<span class=\"sh_symbol\">)<\/span> <span class=\"sh_symbol\">=<\/span> <span class=\"sh_symbol\">(<\/span>zval<span class=\"sh_symbol\">*)<\/span><span class=\"sh_function\">emalloc<\/span><span class=\"sh_symbol\">(<\/span><span class=\"sh_keyword\">sizeof<\/span><span class=\"sh_symbol\">(<\/span>zval_gc_info<span class=\"sh_symbol\">));<\/span> <span class=\"sh_symbol\">\\<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_function\">GC_ZVAL_INIT<\/span><span class=\"sh_symbol\">(<\/span>z<span class=\"sh_symbol\">);<\/span> <span class=\"sh_symbol\">\\<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_cbracket\">}<\/span> <span class=\"sh_keyword\">while<\/span> <span class=\"sh_symbol\">(<\/span><span class=\"sh_number\">0<\/span><span class=\"sh_symbol\">)<\/span><\/li>\n<\/ol>\n<p>\u5b83\u7528zval_gc_info\u52ab\u6301\u4e86zval\u7684\u5206\u914d:<\/p>\n<ol>\n<li><span class=\"sh_keyword\">typedef<\/span> <span class=\"sh_keyword\">struct<\/span> <span class=\"sh_classname\">_zval_gc_info<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zval<\/span> z<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_keyword\">union<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">gc_root_buffer<\/span> <span class=\"sh_symbol\">*<\/span>buffered<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_keyword\">struct<\/span> <span class=\"sh_classname\">_zval_gc_info<\/span> <span class=\"sh_symbol\">*<\/span>next<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_cbracket\">}<\/span> u<span class=\"sh_symbol\">;<\/span><\/li>\n<li><span class=\"sh_cbracket\">}<\/span> zval_gc_info<span class=\"sh_symbol\">;<\/span><\/li>\n<\/ol>\n<p>\u7136\u540e\u7528zval_gc_info\u6765\u6269\u5145\u4e86zval, \u6240\u4ee5\u5b9e\u9645\u4e0a\u6765\u8bf4\u6211\u4eec\u5728PHP5\u65f6\u4ee3\u7533\u8bf7\u4e00\u4e2azval\u5176\u5b9e\u771f\u6b63\u7684\u662f\u5206\u914d\u4e8632\u4e2a\u5b57\u8282, \u4f46\u5176\u5b9eGC\u53ea\u9700\u8981\u5173\u5fc3IS_ARRAY\u548cIS_OBJECT\u7c7b\u578b, \u8fd9\u6837\u5c31\u5bfc\u81f4\u4e86\u5927\u91cf\u7684\u5185\u5b58\u6d6a\u8d39.<\/p>\n<p>\u8fd8\u6bd4\u5982\u6211\u4e4b\u524d\u505a\u7684Taint\u6269\u5c55, \u6211\u9700\u8981\u5bf9\u4e8e\u7ed9\u4e00\u4e9b\u5b57\u7b26\u4e32\u5b58\u50a8\u4e00\u4e9b\u6807\u8bb0, zval\u91cc\u6ca1\u6709\u4efb\u4f55\u5730\u65b9\u53ef\u4ee5\u4f7f\u7528, \u6240\u4ee5\u6211\u4e0d\u5f97\u4e0d\u91c7\u7528\u975e\u5e38\u624b\u6bb5:<\/p>\n<ol>\n<li><span class=\"sh_function\">Z_STRVAL_PP<\/span><span class=\"sh_symbol\">(<\/span>ppzval<span class=\"sh_symbol\">)<\/span> <span class=\"sh_symbol\">=<\/span> <span class=\"sh_function\">erealloc<\/span><span class=\"sh_symbol\">(<\/span><span class=\"sh_function\">Z_STRVAL_PP<\/span><span class=\"sh_symbol\">(<\/span>ppzval<span class=\"sh_symbol\">),<\/span> <span class=\"sh_function\">Z_STRLEN_PP<\/span><span class=\"sh_symbol\">(<\/span>ppzval<span class=\"sh_symbol\">)<\/span> <span class=\"sh_symbol\">+<\/span> <span class=\"sh_number\">1<\/span> <span class=\"sh_symbol\">+<\/span> PHP_TAINT_MAGIC_LENGTH<span class=\"sh_symbol\">);<\/span><\/li>\n<li><span class=\"sh_function\">PHP_TAINT_MARK<\/span><span class=\"sh_symbol\">(*<\/span>ppzval<span class=\"sh_symbol\">,<\/span> PHP_TAINT_MAGIC_POSSIBLE<span class=\"sh_symbol\">);<\/span><\/li>\n<\/ol>\n<p>\u5c31\u662f\u628a\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\u6269\u5145\u4e00\u4e2aint, \u7136\u540e\u7528magic number\u505a\u6807\u8bb0\u5199\u5230\u540e\u9762\u53bb, \u8fd9\u6837\u7684\u505a\u6cd5\u5b89\u5168\u6027\u548c\u7a33\u5b9a\u6027\u5728\u6280\u672f\u4e0a\u90fd\u662f\u6ca1\u6709\u4fdd\u969c\u7684<\/p>\n<p>\u7b2c\u4e09, PHP\u7684zval\u5927\u90e8\u5206\u90fd\u662f\u6309\u503c\u4f20\u9012, \u5199\u65f6\u62f7\u8d1d\u7684\u503c, \u4f46\u662f\u6709\u4fe9\u4e2a\u4f8b\u5916, \u5c31\u662f\u5bf9\u8c61\u548c\u8d44\u6e90, \u4ed6\u4eec\u6c38\u8fdc\u90fd\u662f\u6309\u5f15\u7528\u4f20\u9012, \u8fd9\u6837\u5c31\u9020\u6210\u4e00\u4e2a\u95ee\u9898, \u5bf9\u8c61\u548c\u8d44\u6e90\u5728\u9664\u4e86zval\u4e2d\u7684\u5f15\u7528\u8ba1\u6570\u4ee5\u5916, \u8fd8\u9700\u8981\u4e00\u4e2a\u5168\u5c40\u7684\u5f15\u7528\u8ba1\u6570, \u8fd9\u6837\u624d\u80fd\u4fdd\u8bc1\u5185\u5b58\u53ef\u4ee5\u56de\u6536. \u6240\u4ee5\u5728PHP5\u7684\u65f6\u4ee3, \u4ee5\u5bf9\u8c61\u4e3a\u4f8b, \u5b83\u6709\u4fe9\u5957\u5f15\u7528\u8ba1\u6570, \u4e00\u4e2a\u662fzval\u4e2d\u7684, \u53e6\u5916\u4e00\u4e2a\u662fobj\u81ea\u8eab\u7684\u8ba1\u6570:<\/p>\n<ol>\n<li><span class=\"sh_keyword\">typedef<\/span> <span class=\"sh_keyword\">struct<\/span> <span class=\"sh_classname\">_zend_object_store_bucket<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_bool<\/span> destructor_called<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_bool<\/span> valid<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_keyword\">union<\/span> _store_bucket <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_keyword\">struct<\/span> <span class=\"sh_classname\">_store_object<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_type\">void<\/span> <span class=\"sh_symbol\">*<\/span>object<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_objects_store_dtor_t<\/span> dtor<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_objects_free_object_storage_t<\/span> free_storage<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_objects_store_clone_t<\/span> clone<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_keyword\">const<\/span> <span class=\"sh_usertype\">zend_object_handlers<\/span> <span class=\"sh_symbol\">*<\/span>handlers<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_uint<\/span> refcount<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">gc_root_buffer<\/span> <span class=\"sh_symbol\">*<\/span>buffered<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_cbracket\">}<\/span> obj<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_keyword\">struct<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_type\">int<\/span> next<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_cbracket\">}<\/span> free_list<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_cbracket\">}<\/span> bucket<span class=\"sh_symbol\">;<\/span><\/li>\n<li><span class=\"sh_cbracket\">}<\/span> zend_object_store_bucket<span class=\"sh_symbol\">;<\/span><\/li>\n<\/ol>\n<p>\u9664\u4e86\u4e0a\u9762\u63d0\u5230\u7684\u4e24\u5957\u5f15\u7528\u4ee5\u5916, \u5982\u679c\u6211\u4eec\u8981\u83b7\u53d6\u4e00\u4e2aobject, \u5219\u6211\u4eec\u9700\u8981\u901a\u8fc7\u5982\u4e0b\u65b9\u5f0f:<\/p>\n<ol>\n<li><span class=\"sh_function\">EG<\/span><span class=\"sh_symbol\">(<\/span>objects_store<span class=\"sh_symbol\">).<\/span>object_buckets<span class=\"sh_symbol\">[<\/span><span class=\"sh_function\">Z_OBJ_HANDLE_P<\/span><span class=\"sh_symbol\">(<\/span>z<span class=\"sh_symbol\">)].<\/span>bucket<span class=\"sh_symbol\">.<\/span>obj<\/li>\n<\/ol>\n<p>\u7ecf\u8fc7\u6f2b\u957f\u7684\u591a\u6b21\u5185\u5b58\u8bfb\u53d6, \u624d\u80fd\u83b7\u53d6\u5230\u771f\u6b63\u7684objec\u5bf9\u8c61\u672c\u8eab. \u6548\u7387\u53ef\u60f3\u800c\u77e5.<\/p>\n<p>\u8fd9\u4e00\u5207\u90fd\u662f\u56e0\u4e3aZend\u5f15\u64ce\u6700\u521d\u8bbe\u8ba1\u7684\u65f6\u5019, \u5e76\u6ca1\u6709\u8003\u8651\u5230\u540e\u6765\u7684\u5bf9\u8c61. \u4e00\u4e2a\u826f\u597d\u7684\u8bbe\u8ba1, \u4e00\u65e6\u6709\u4e86\u610f\u5916, \u5c31\u4f1a\u5bfc\u81f4\u6574\u4e2a\u7ed3\u6784\u53d8\u5f97\u590d\u6742, \u7ef4\u62a4\u6027\u964d\u4f4e, \u8fd9\u662f\u4e00\u4e2a\u5f88\u597d\u7684\u4f8b\u5b50.<\/p>\n<p>\u7b2c\u56db, \u6211\u4eec\u77e5\u9053PHP\u4e2d, \u5927\u91cf\u7684\u8ba1\u7b97\u90fd\u662f\u9762\u5411\u5b57\u7b26\u4e32\u7684, \u7136\u800c\u56e0\u4e3a\u5f15\u7528\u8ba1\u6570\u662f\u4f5c\u7528\u5728zval\u7684, \u90a3\u4e48\u5c31\u4f1a\u5bfc\u81f4\u5982\u679c\u8981\u62f7\u8d1d\u4e00\u4e2a\u5b57\u7b26\u4e32\u7c7b\u578b\u7684zval, \u6211\u4eec\u522b\u65e0\u4ed6\u6cd5\u53ea\u80fd\u590d\u5236\u8fd9\u4e2a\u5b57\u7b26\u4e32. \u5f53\u6211\u4eec\u628a\u4e00\u4e2azval\u7684\u5b57\u7b26\u4e32\u4f5c\u4e3akey\u6dfb\u52a0\u5230\u4e00\u4e2a\u6570\u7ec4\u91cc\u7684\u65f6\u5019, \u6211\u4eec\u522b\u65e0\u4ed6\u6cd5\u53ea\u80fd\u590d\u5236\u8fd9\u4e2a\u5b57\u7b26\u4e32. \u867d\u7136\u5728PHP5.4\u7684\u65f6\u5019, \u6211\u4eec\u5f15\u5165\u4e86INTERNED STRING, \u4f46\u662f\u8fd8\u662f\u4e0d\u80fd\u6839\u672c\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898.<\/p>\n<p>\u8fd8\u6bd4\u5982, PHP\u4e2d\u5927\u91cf\u7684\u7ed3\u6784\u4f53\u90fd\u662f\u57fa\u4e8eHashtable\u5b9e\u73b0\u7684, \u589e\u5220\u6539\u67e5Hashtable\u7684\u64cd\u4f5c\u5360\u636e\u4e86\u5927\u91cf\u7684CPU\u65f6\u95f4, \u800c\u5b57\u7b26\u4e32\u8981\u67e5\u627e\u9996\u5148\u8981\u6c42\u5b83\u7684Hash\u503c, \u7406\u8bba\u4e0a\u6211\u4eec\u5b8c\u5168\u53ef\u4ee5\u628a\u4e00\u4e2a\u5b57\u7b26\u4e32\u7684Hash\u503c\u8ba1\u7b97\u597d\u4ee5\u540e, \u5c31\u5b58\u4e0b\u6765, \u907f\u514d\u518d\u6b21\u8ba1\u7b97\u7b49\u7b49<\/p>\n<p>\u7b2c\u4e94, \u8fd9\u4e2a\u662f\u5173\u4e8e\u5f15\u7528\u7684, PHP5\u7684\u65f6\u4ee3, \u6211\u4eec\u91c7\u7528\u5199\u65f6\u5206\u79bb, \u4f46\u662f\u7ed3\u5408\u5230\u5f15\u7528\u8fd9\u91cc\u5c31\u6709\u4e86\u4e00\u4e2a\u7ecf\u5178\u7684\u6027\u80fd\u95ee\u9898:<\/p>\n<ol>\n<li><span class=\"sh_symbol\">&lt;?php<\/span><\/li>\n<li><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_keyword\">function<\/span> <span class=\"sh_function\">dummy<\/span><span class=\"sh_symbol\">(<\/span><span class=\"sh_variable\">$array<\/span><span class=\"sh_symbol\">)<\/span> <span class=\"sh_cbracket\">{}<\/span><\/li>\n<li><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_variable\">$array<\/span> <span class=\"sh_symbol\">=<\/span> <span class=\"sh_function\">range<\/span><span class=\"sh_symbol\">(<\/span><span class=\"sh_number\">1<\/span><span class=\"sh_symbol\">,<\/span> <span class=\"sh_number\">100000<\/span><span class=\"sh_symbol\">);<\/span><\/li>\n<li><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_variable\">$b<\/span> <span class=\"sh_symbol\">=<\/span> <span class=\"sh_symbol\">&amp;<\/span><span class=\"sh_variable\">$array<\/span><span class=\"sh_symbol\">;<\/span><\/li>\n<li><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_function\">dummy<\/span><span class=\"sh_symbol\">(<\/span><span class=\"sh_variable\">$array<\/span><span class=\"sh_symbol\">);<\/span><\/li>\n<li><span class=\"sh_symbol\">?&gt;<\/span><\/li>\n<\/ol>\n<p>\u5f53\u6211\u4eec\u8c03\u7528dummy\u7684\u65f6\u5019, \u672c\u6765\u53ea\u662f\u7b80\u5355\u7684\u4e00\u4e2a\u4f20\u503c\u5c31\u884c\u7684\u5730\u65b9, \u4f46\u662f\u56e0\u4e3a$array\u66fe\u7ecf\u5f15\u7528\u8d4b\u503c\u7ed9\u4e86$b, \u6240\u4ee5\u5bfc\u81f4$array\u53d8\u6210\u4e86\u4e00\u4e2a\u5f15\u7528, \u4e8e\u662f\u6b64\u5904\u5c31\u4f1a\u53d1\u751f\u5206\u79bb, \u5bfc\u81f4\u6570\u7ec4\u590d\u5236, \u4ece\u800c\u6781\u5927\u7684\u62d6\u6162\u6027\u80fd, \u8fd9\u91cc\u6709\u4e00\u4e2a\u7b80\u5355\u7684\u6d4b\u8bd5:<\/p>\n<ol>\n<li><span class=\"sh_symbol\">&lt;?php<\/span><\/li>\n<li><span class=\"sh_variable\">$array<\/span> <span class=\"sh_symbol\">=<\/span> <span class=\"sh_function\">range<\/span><span class=\"sh_symbol\">(<\/span><span class=\"sh_number\">1<\/span><span class=\"sh_symbol\">,<\/span> <span class=\"sh_number\">100000<\/span><span class=\"sh_symbol\">);<\/span><\/li>\n<li><\/li>\n<li><span class=\"sh_keyword\">function<\/span> <span class=\"sh_function\">dummy<\/span><span class=\"sh_symbol\">(<\/span><span class=\"sh_variable\">$array<\/span><span class=\"sh_symbol\">)<\/span> <span class=\"sh_cbracket\">{}<\/span><\/li>\n<li><\/li>\n<li><span class=\"sh_variable\">$i<\/span> <span class=\"sh_symbol\">=<\/span> <span class=\"sh_number\">0<\/span><span class=\"sh_symbol\">;<\/span><\/li>\n<li><span class=\"sh_variable\">$start<\/span> <span class=\"sh_symbol\">=<\/span> <span class=\"sh_function\">microtime<\/span><span class=\"sh_symbol\">(<\/span>true<span class=\"sh_symbol\">);<\/span><\/li>\n<li><span class=\"sh_keyword\">while<\/span><span class=\"sh_symbol\">(<\/span><span class=\"sh_variable\">$i<\/span><span class=\"sh_symbol\">++<\/span> <span class=\"sh_symbol\">&lt;<\/span> <span class=\"sh_number\">100<\/span><span class=\"sh_symbol\">)<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_function\">dummy<\/span><span class=\"sh_symbol\">(<\/span><span class=\"sh_variable\">$array<\/span><span class=\"sh_symbol\">);<\/span><\/li>\n<li><span class=\"sh_cbracket\">}<\/span><\/li>\n<li><\/li>\n<li><span class=\"sh_function\">printf<\/span><span class=\"sh_symbol\">(<\/span><span class=\"sh_string\">&#8220;Used %sS\\n&#8221;<\/span><span class=\"sh_symbol\">,<\/span> <span class=\"sh_function\">microtime<\/span><span class=\"sh_symbol\">(<\/span>true<span class=\"sh_symbol\">)<\/span> <span class=\"sh_symbol\">&#8211;<\/span> <span class=\"sh_variable\">$start<\/span><span class=\"sh_symbol\">);<\/span><\/li>\n<li><\/li>\n<li><span class=\"sh_variable\">$b<\/span> <span class=\"sh_symbol\">=<\/span> <span class=\"sh_symbol\">&amp;<\/span><span class=\"sh_variable\">$array<\/span><span class=\"sh_symbol\">;<\/span> <span class=\"sh_comment\">\/\/\u6ce8\u610f\u8fd9\u91cc, \u5047\u8bbe\u6211\u4e0d\u5c0f\u5fc3\u628a\u8fd9\u4e2aArray\u5f15\u7528\u7ed9\u4e86\u4e00\u4e2a\u53d8\u91cf<\/span><\/li>\n<li><span class=\"sh_variable\">$i<\/span> <span class=\"sh_symbol\">=<\/span> <span class=\"sh_number\">0<\/span><span class=\"sh_symbol\">;<\/span><\/li>\n<li><span class=\"sh_variable\">$start<\/span> <span class=\"sh_symbol\">=<\/span> <span class=\"sh_function\">microtime<\/span><span class=\"sh_symbol\">(<\/span>true<span class=\"sh_symbol\">);<\/span><\/li>\n<li><span class=\"sh_keyword\">while<\/span><span class=\"sh_symbol\">(<\/span><span class=\"sh_variable\">$i<\/span><span class=\"sh_symbol\">++<\/span> <span class=\"sh_symbol\">&lt;<\/span> <span class=\"sh_number\">100<\/span><span class=\"sh_symbol\">)<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_function\">dummy<\/span><span class=\"sh_symbol\">(<\/span><span class=\"sh_variable\">$array<\/span><span class=\"sh_symbol\">);<\/span><\/li>\n<li><span class=\"sh_cbracket\">}<\/span><\/li>\n<li><span class=\"sh_function\">printf<\/span><span class=\"sh_symbol\">(<\/span><span class=\"sh_string\">&#8220;Used %ss\\n&#8221;<\/span><span class=\"sh_symbol\">,<\/span> <span class=\"sh_function\">microtime<\/span><span class=\"sh_symbol\">(<\/span>true<span class=\"sh_symbol\">)<\/span> <span class=\"sh_symbol\">&#8211;<\/span> <span class=\"sh_variable\">$start<\/span><span class=\"sh_symbol\">);<\/span><\/li>\n<li><span class=\"sh_symbol\">?&gt;<\/span><\/li>\n<\/ol>\n<p>\u6211\u4eec\u57285.6\u4e0b\u8fd0\u884c\u8fd9\u4e2a\u4f8b\u5b50, \u5f97\u5230\u5982\u4e0b\u7ed3\u679c:<\/p>\n<ol>\n<li>$ php-5.6\/sapi\/cli\/php \/tmp\/1.php<\/li>\n<li>Used 0.00045204162597656s<\/li>\n<li>Used 4.2051479816437s<\/li>\n<\/ol>\n<p>\u76f8\u5dee1\u4e07\u500d\u4e4b\u591a. \u8fd9\u5c31\u9020\u6210, \u5982\u679c\u5728\u4e00\u5927\u6bb5\u4ee3\u7801\u4e2d, \u6211\u4e0d\u5c0f\u5fc3\u628a\u4e00\u4e2a\u53d8\u91cf\u53d8\u6210\u4e86\u5f15\u7528(\u6bd4\u5982foreach as &amp;$v), \u90a3\u4e48\u5c31\u6709\u53ef\u80fd\u89e6\u53d1\u5230\u8fd9\u4e2a\u95ee\u9898, \u9020\u6210\u4e25\u91cd\u7684\u6027\u80fd\u95ee\u9898, \u7136\u800c\u5374\u53c8\u5f88\u96be\u6392\u67e5.<\/p>\n<p>\u7b2c\u516d, \u4e5f\u662f\u6700\u91cd\u8981\u7684\u4e00\u4e2a, \u4e3a\u4ec0\u4e48\u8bf4\u5b83\u91cd\u8981\u5462? \u56e0\u4e3a\u8fd9\u70b9\u4fc3\u6210\u4e86\u5f88\u5927\u7684\u6027\u80fd\u63d0\u5347, \u6211\u4eec\u4e60\u60ef\u4e86\u5728PHP5\u7684\u65f6\u4ee3\u8c03\u7528MAKE_STD_ZVAL\u5728\u5806\u5185\u5b58\u4e0a\u5206\u914d\u4e00\u4e2azval, \u7136\u540e\u5bf9\u4ed6\u8fdb\u884c\u64cd\u4f5c, \u6700\u540e\u5462\u901a\u8fc7RETURN_ZVAL\u628a\u8fd9\u4e2azval\u7684\u503c\u201dcopy\u201d\u7ed9return_value, \u7136\u540e\u53c8\u9500\u6bc1\u4e86\u8fd9\u4e2azval, \u6bd4\u5982pathinfo\u8fd9\u4e2a\u51fd\u6570:<\/p>\n<ol>\n<li><span class=\"sh_function\">PHP_FUNCTION<\/span><span class=\"sh_symbol\">(<\/span>pathinfo<span class=\"sh_symbol\">)<\/span><\/li>\n<li><span class=\"sh_cbracket\">{<\/span><\/li>\n<li><span class=\"sh_symbol\">&#8230;..<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_function\">MAKE_STD_ZVAL<\/span><span class=\"sh_symbol\">(<\/span>tmp<span class=\"sh_symbol\">);<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_function\">array_init<\/span><span class=\"sh_symbol\">(<\/span>tmp<span class=\"sh_symbol\">);<\/span><\/li>\n<li><span class=\"sh_symbol\">&#8230;..<\/span><\/li>\n<li><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_keyword\">if<\/span> <span class=\"sh_symbol\">(<\/span>opt <span class=\"sh_symbol\">==<\/span> PHP_PATHINFO_ALL<span class=\"sh_symbol\">)<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_function\">RETURN_ZVAL<\/span><span class=\"sh_symbol\">(<\/span>tmp<span class=\"sh_symbol\">,<\/span> <span class=\"sh_number\">0<\/span><span class=\"sh_symbol\">,<\/span> <span class=\"sh_number\">1<\/span><span class=\"sh_symbol\">);<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_cbracket\">}<\/span> <span class=\"sh_keyword\">else<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li><span class=\"sh_symbol\">&#8230;..<\/span><\/li>\n<li><span class=\"sh_cbracket\">}<\/span><\/li>\n<\/ol>\n<p>\u8fd9\u4e2atmp\u53d8\u91cf, \u5b8c\u5168\u662f\u4e00\u4e2a\u4e34\u65f6\u53d8\u91cf\u7684\u4f5c\u7528, \u6211\u4eec\u53c8\u4f55\u5fc5\u5728\u5806\u5185\u5b58\u5206\u914d\u5b83\u5462? MAKE_STD_ZVAL\/ALLOC_ZVAL\u5728PHP5\u7684\u65f6\u5019, \u5230\u5904\u90fd\u6709, \u662f\u4e00\u4e2a\u975e\u5e38\u5e38\u89c1\u7684\u7528\u6cd5, \u5982\u679c\u6211\u4eec\u80fd\u628a\u8fd9\u4e2a\u53d8\u91cf\u7528\u6808\u5206\u914d, \u90a3\u65e0\u8bba\u662f\u5185\u5b58\u5206\u914d, \u8fd8\u662f\u7f13\u5b58\u53cb\u597d, \u90fd\u662f\u975e\u5e38\u6709\u5229\u7684<\/p>\n<p>\u8fd8\u6709\u5f88\u591a, \u6211\u5c31\u4e0d\u4e00\u4e00\u8be6\u7ec6\u5217\u4e3e\u4e86, \u4f46\u662f\u6211\u76f8\u4fe1\u4f60\u4eec\u4e5f\u6709\u4e86\u548c\u6211\u4eec\u5f53\u65f6\u4e00\u6837\u7684\u60f3\u6cd5, zval\u5fc5\u987b\u5f97\u6539\u6539\u4e86, \u5bf9\u5427?<\/p>\n<h3>\u73b0\u5728\u7684zval<\/h3>\n<p>\u5230\u4e86PHP7\u4e2d, zval\u53d8\u6210\u4e86\u5982\u4e0b\u7684\u7ed3\u6784, \u8981\u8bf4\u660e\u7684\u662f, \u8fd9\u4e2a\u662f\u73b0\u5728\u7684\u7ed3\u6784, \u5df2\u7ecf\u548cPHPNG\u65f6\u5019\u6709\u4e86\u4e00\u4e9b\u4e0d\u540c\u4e86, \u56e0\u4e3a\u6211\u4eec\u65b0\u589e\u52a0\u4e86\u4e00\u4e9b\u89e3\u91ca (\u8054\u5408\u4f53\u7684\u5b57\u6bb5), \u4f46\u662f\u603b\u4f53\u5927\u5c0f, \u7ed3\u6784, \u662f\u548cPHPNG\u7684\u65f6\u5019\u4e00\u81f4\u7684:<\/p>\n<ol>\n<li><span class=\"sh_keyword\">struct<\/span> <span class=\"sh_classname\">_zval_struct<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_keyword\">union<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_long<\/span> lval<span class=\"sh_symbol\">;<\/span> <span class=\"sh_comment\">\/* long value *\/<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_type\">double<\/span> dval<span class=\"sh_symbol\">;<\/span> <span class=\"sh_comment\">\/* double value *\/<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_refcounted<\/span> <span class=\"sh_symbol\">*<\/span>counted<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_string<\/span> <span class=\"sh_symbol\">*<\/span>str<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_array<\/span> <span class=\"sh_symbol\">*<\/span>arr<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_object<\/span> <span class=\"sh_symbol\">*<\/span>obj<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_resource<\/span> <span class=\"sh_symbol\">*<\/span>res<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_reference<\/span> <span class=\"sh_symbol\">*<\/span>ref<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_ast_ref<\/span> <span class=\"sh_symbol\">*<\/span>ast<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zval<\/span> <span class=\"sh_symbol\">*<\/span>zv<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_type\">void<\/span> <span class=\"sh_symbol\">*<\/span>ptr<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_class_entry<\/span> <span class=\"sh_symbol\">*<\/span>ce<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_function<\/span> <span class=\"sh_symbol\">*<\/span>func<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_keyword\">struct<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">uint32_t<\/span> w1<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">uint32_t<\/span> w2<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_cbracket\">}<\/span> ww<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_cbracket\">}<\/span> value<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_keyword\">union<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_keyword\">struct<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_function\">ZEND_ENDIAN_LOHI_4<\/span><span class=\"sh_symbol\">(<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_uchar<\/span> type<span class=\"sh_symbol\">,<\/span> <span class=\"sh_comment\">\/* active type *\/<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_uchar<\/span> type_flags<span class=\"sh_symbol\">,<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_uchar<\/span> const_flags<span class=\"sh_symbol\">,<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_uchar<\/span> reserved<span class=\"sh_symbol\">)<\/span> <span class=\"sh_comment\">\/* call info for EX(This) *\/<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_cbracket\">}<\/span> v<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">uint32_t<\/span> type_info<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_cbracket\">}<\/span> u1<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_keyword\">union<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">uint32_t<\/span> var_flags<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">uint32_t<\/span> next<span class=\"sh_symbol\">;<\/span> <span class=\"sh_comment\">\/* hash collision chain *\/<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">uint32_t<\/span> cache_slot<span class=\"sh_symbol\">;<\/span> <span class=\"sh_comment\">\/* literal cache slot *\/<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">uint32_t<\/span> lineno<span class=\"sh_symbol\">;<\/span> <span class=\"sh_comment\">\/* line number (for ast nodes) *\/<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">uint32_t<\/span> num_args<span class=\"sh_symbol\">;<\/span> <span class=\"sh_comment\">\/* arguments number for EX(This) *\/<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">uint32_t<\/span> fe_pos<span class=\"sh_symbol\">;<\/span> <span class=\"sh_comment\">\/* foreach position *\/<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">uint32_t<\/span> fe_iter_idx<span class=\"sh_symbol\">;<\/span> <span class=\"sh_comment\">\/* foreach iterator index *\/<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_cbracket\">}<\/span> u2<span class=\"sh_symbol\">;<\/span><\/li>\n<li><span class=\"sh_cbracket\">}<\/span><span class=\"sh_symbol\">;<\/span><\/li>\n<\/ol>\n<p>\u867d\u7136\u770b\u8d77\u6765\u53d8\u5f97\u597d\u5927, \u4f46\u5176\u5b9e\u4f60\u4ed4\u7ec6\u770b, \u5168\u90e8\u90fd\u662f\u8054\u5408\u4f53, \u8fd9\u4e2a\u65b0\u7684zval\u572864\u4f4d\u73af\u5883\u4e0b,\u73b0\u5728\u53ea\u9700\u898116\u4e2a\u5b57\u8282(2\u4e2a\u6307\u9488size), \u5b83\u4e3b\u8981\u5206\u4e3a\u4fe9\u4e2a\u90e8\u5206, value\u548c\u6269\u5145\u5b57\u6bb5, \u800c\u6269\u5145\u5b57\u6bb5\u53c8\u5206\u4e3au1\u548cu2\u4fe9\u4e2a\u90e8\u5206, \u5176\u4e2du1\u662ftype info, u2\u662f\u5404\u79cd\u8f85\u52a9\u5b57\u6bb5.<\/p>\n<p>\u5176\u4e2dvalue\u90e8\u5206, \u662f\u4e00\u4e2asize_t\u5927\u5c0f(\u4e00\u4e2a\u6307\u9488\u5927\u5c0f), \u53ef\u4ee5\u4fdd\u5b58\u4e00\u4e2a\u6307\u9488, \u6216\u8005\u4e00\u4e2along, \u6216\u8005\u4e00\u4e2adouble.<\/p>\n<p>\u800ctype info\u90e8\u5206\u5219\u4fdd\u5b58\u4e86\u8fd9\u4e2azval\u7684\u7c7b\u578b. \u6269\u5145\u8f85\u52a9\u5b57\u6bb5\u5219\u4f1a\u5728\u591a\u4e2a\u5176\u4ed6\u5730\u65b9\u4f7f\u7528, \u6bd4\u5982next, \u5c31\u7528\u5728\u53d6\u4ee3Hashtable\u4e2d\u539f\u6765\u7684\u62c9\u94fe\u6307\u9488, \u8fd9\u90e8\u5206\u4f1a\u5728\u4ee5\u540e\u4ecb\u7ecdHashTable\u7684\u65f6\u5019\u518d\u6765\u8be6\u89e3.<\/p>\n<h3>\u7c7b\u578b<\/h3>\n<p>PHP7\u4e2d\u7684zval\u7684\u7c7b\u578b\u505a\u4e86\u6bd4\u8f83\u5927\u7684\u8c03\u6574, \u603b\u4f53\u6765\u8bf4\u6709\u5982\u4e0b17\u79cd\u7c7b\u578b:<\/p>\n<ol>\n<li><span class=\"sh_comment\">\/* regular data types *\/<\/span><\/li>\n<li><span class=\"sh_preproc\">#define<\/span> IS_UNDEF <span class=\"sh_number\">0<\/span><\/li>\n<li><span class=\"sh_preproc\">#define<\/span> IS_NULL <span class=\"sh_number\">1<\/span><\/li>\n<li><span class=\"sh_preproc\">#define<\/span> IS_FALSE <span class=\"sh_number\">2<\/span><\/li>\n<li><span class=\"sh_preproc\">#define<\/span> IS_TRUE <span class=\"sh_number\">3<\/span><\/li>\n<li><span class=\"sh_preproc\">#define<\/span> IS_LONG <span class=\"sh_number\">4<\/span><\/li>\n<li><span class=\"sh_preproc\">#define<\/span> IS_DOUBLE <span class=\"sh_number\">5<\/span><\/li>\n<li><span class=\"sh_preproc\">#define<\/span> IS_STRING <span class=\"sh_number\">6<\/span><\/li>\n<li><span class=\"sh_preproc\">#define<\/span> IS_ARRAY <span class=\"sh_number\">7<\/span><\/li>\n<li><span class=\"sh_preproc\">#define<\/span> IS_OBJECT <span class=\"sh_number\">8<\/span><\/li>\n<li><span class=\"sh_preproc\">#define<\/span> IS_RESOURCE <span class=\"sh_number\">9<\/span><\/li>\n<li><span class=\"sh_preproc\">#define<\/span> IS_REFERENCE <span class=\"sh_number\">10<\/span><\/li>\n<li><\/li>\n<li><span class=\"sh_comment\">\/* constant expressions *\/<\/span><\/li>\n<li><span class=\"sh_preproc\">#define<\/span> IS_CONSTANT <span class=\"sh_number\">11<\/span><\/li>\n<li><span class=\"sh_preproc\">#define<\/span> IS_CONSTANT_AST <span class=\"sh_number\">12<\/span><\/li>\n<li><\/li>\n<li><span class=\"sh_comment\">\/* fake types *\/<\/span><\/li>\n<li><span class=\"sh_preproc\">#define<\/span> _IS_BOOL <span class=\"sh_number\">13<\/span><\/li>\n<li><span class=\"sh_preproc\">#define<\/span> IS_CALLABLE <span class=\"sh_number\">14<\/span><\/li>\n<li><\/li>\n<li><span class=\"sh_comment\">\/* internal types *\/<\/span><\/li>\n<li><span class=\"sh_preproc\">#define<\/span> IS_INDIRECT <span class=\"sh_number\">15<\/span><\/li>\n<li><span class=\"sh_preproc\">#define<\/span> IS_PTR <span class=\"sh_number\">17<\/span><\/li>\n<\/ol>\n<p>\u5176\u4e2dPHP5\u7684\u65f6\u5019\u7684IS_BOOL\u7c7b\u578b, \u73b0\u5728\u62c6\u5206\u6210\u4e86IS_FALSE\u548cIS_TRUE\u4fe9\u79cd\u7c7b\u578b. \u800c\u539f\u6765\u7684\u5f15\u7528\u662f\u4e00\u4e2a\u6807\u5fd7\u4f4d, \u73b0\u5728\u7684\u5f15\u7528\u662f\u4e00\u79cd\u65b0\u7684\u7c7b\u578b.<\/p>\n<p>\u5bf9\u4e8eIS_INDIRECT\u548cIS_PTR\u6765\u8bf4, \u8fd9\u4fe9\u4e2a\u7c7b\u578b\u662f\u7528\u5728\u5185\u90e8\u7684\u4fdd\u7559\u7c7b\u578b, \u7528\u6237\u4e0d\u4f1a\u611f\u77e5\u5230, \u8fd9\u90e8\u5206\u4f1a\u5728\u540e\u7eed\u4ecb\u7ecdHashTable\u7684\u65f6\u5019\u4e5f\u4e00\u5e76\u4ecb\u7ecd.<\/p>\n<p>\u4ecePHP7\u5f00\u59cb, \u5bf9\u4e8e\u5728zval\u7684value\u5b57\u6bb5\u4e2d\u80fd\u4fdd\u5b58\u4e0b\u7684\u503c, \u5c31\u4e0d\u518d\u5bf9\u4ed6\u4eec\u8fdb\u884c\u5f15\u7528\u8ba1\u6570\u4e86, \u800c\u662f\u5728\u62f7\u8d1d\u7684\u65f6\u5019\u76f4\u63a5\u8d4b\u503c, \u8fd9\u6837\u5c31\u7701\u6389\u4e86\u5927\u91cf\u7684\u5f15\u7528\u8ba1\u6570\u76f8\u5173\u7684\u64cd\u4f5c, \u8fd9\u90e8\u5206\u7c7b\u578b\u6709:<\/p>\n<ol>\n<li>IS_LONG<\/li>\n<li>IS_DOUBLE<\/li>\n<\/ol>\n<p>\u5f53\u7136\u5bf9\u4e8e\u90a3\u79cd\u6839\u672c\u6ca1\u6709\u503c, \u53ea\u6709\u7c7b\u578b\u7684\u7c7b\u578b, \u4e5f\u4e0d\u9700\u8981\u5f15\u7528\u8ba1\u6570\u4e86:<\/p>\n<ol>\n<li>IS_NULL<\/li>\n<li>IS_FALSE<\/li>\n<li>IS_TRUE<\/li>\n<\/ol>\n<p>\u800c\u5bf9\u4e8e\u590d\u6742\u7c7b\u578b, \u4e00\u4e2asize_t\u4fdd\u5b58\u4e0d\u4e0b\u7684, \u90a3\u4e48\u6211\u4eec\u5c31\u7528value\u6765\u4fdd\u5b58\u4e00\u4e2a\u6307\u9488, \u8fd9\u4e2a\u6307\u9488\u6307\u5411\u8fd9\u4e2a\u5177\u4f53\u7684\u503c, \u5f15\u7528\u8ba1\u6570\u4e5f\u968f\u4e4b\u4f5c\u7528\u4e8e\u8fd9\u4e2a\u503c\u4e0a, \u800c\u4e0d\u5728\u662f\u4f5c\u7528\u4e8ezval\u4e0a\u4e86.<br \/>\n<a href=\"https:\/\/yanjingang.com\/blog\/?attachment_id=1795\" rel=\"attachment wp-att-1795\"><img loading=\"lazy\" class=\"alignnone size-full wp-image-1795\" src=\"https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2018\/10\/zval1.png\" alt=\"\" width=\"940\" height=\"404\" srcset=\"https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2018\/10\/zval1.png 940w, https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2018\/10\/zval1-300x129.png 300w, https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2018\/10\/zval1-768x330.png 768w, https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2018\/10\/zval1-624x268.png 624w\" sizes=\"(max-width: 940px) 100vw, 940px\" \/><\/a><\/p>\n<p>\u4ee5IS_ARRAY\u4e3a\u4f8b:<\/p>\n<ol>\n<li><span class=\"sh_keyword\">struct<\/span> <span class=\"sh_classname\">_zend_array<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_refcounted_h<\/span> gc<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_keyword\">union<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_keyword\">struct<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_function\">ZEND_ENDIAN_LOHI_4<\/span><span class=\"sh_symbol\">(<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_uchar<\/span> flags<span class=\"sh_symbol\">,<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_uchar<\/span> nApplyCount<span class=\"sh_symbol\">,<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_uchar<\/span> nIteratorsCount<span class=\"sh_symbol\">,<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_uchar<\/span> reserve<span class=\"sh_symbol\">)<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_cbracket\">}<\/span> v<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">uint32_t<\/span> flags<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_cbracket\">}<\/span> u<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">uint32_t<\/span> nTableMask<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">Bucket<\/span> <span class=\"sh_symbol\">*<\/span>arData<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">uint32_t<\/span> nNumUsed<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">uint32_t<\/span> nNumOfElements<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">uint32_t<\/span> nTableSize<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">uint32_t<\/span> nInternalPointer<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_long<\/span> nNextFreeElement<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">dtor_func_t<\/span> pDestructor<span class=\"sh_symbol\">;<\/span><\/li>\n<li><span class=\"sh_cbracket\">}<\/span><span class=\"sh_symbol\">;<\/span><\/li>\n<\/ol>\n<p>zval.value.arr\u5c06\u6307\u5411\u4e0a\u9762\u7684\u8fd9\u6837\u7684\u4e00\u4e2a\u7ed3\u6784\u4f53, \u7531\u5b83\u5b9e\u9645\u4fdd\u5b58\u4e00\u4e2a\u6570\u7ec4, \u5f15\u7528\u8ba1\u6570\u90e8\u5206\u4fdd\u5b58\u5728zend_refcounted_h\u7ed3\u6784\u4e2d:<\/p>\n<ol>\n<li><span class=\"sh_keyword\">typedef<\/span> <span class=\"sh_keyword\">struct<\/span> <span class=\"sh_classname\">_zend_refcounted_h<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">uint32_t<\/span> refcount<span class=\"sh_symbol\">;<\/span> <span class=\"sh_comment\">\/* reference counter 32-bit *\/<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_keyword\">union<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_keyword\">struct<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_function\">ZEND_ENDIAN_LOHI_3<\/span><span class=\"sh_symbol\">(<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_uchar<\/span> type<span class=\"sh_symbol\">,<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_uchar<\/span> flags<span class=\"sh_symbol\">,<\/span> <span class=\"sh_comment\">\/* used for strings &amp; objects *\/<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">uint16_t<\/span> gc_info<span class=\"sh_symbol\">)<\/span> <span class=\"sh_comment\">\/* keeps GC root number (or 0) and color *\/<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_cbracket\">}<\/span> v<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">uint32_t<\/span> type_info<span class=\"sh_symbol\">;<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_cbracket\">}<\/span> u<span class=\"sh_symbol\">;<\/span><\/li>\n<li><span class=\"sh_cbracket\">}<\/span> zend_refcounted_h<span class=\"sh_symbol\">;<\/span><\/li>\n<\/ol>\n<p>\u6240\u6709\u7684\u590d\u6742\u7c7b\u578b\u7684\u5b9a\u4e49, \u5f00\u59cb\u7684\u65f6\u5019\u90fd\u662fzend_refcounted_h\u7ed3\u6784, \u8fd9\u4e2a\u7ed3\u6784\u91cc\u9664\u4e86\u5f15\u7528\u8ba1\u6570\u4ee5\u5916, \u8fd8\u6709GC\u76f8\u5173\u7684\u7ed3\u6784. \u4ece\u800c\u5728\u505aGC\u56de\u6536\u7684\u65f6\u5019, GC\u4e0d\u9700\u8981\u5173\u5fc3\u5177\u4f53\u7c7b\u578b\u662f\u4ec0\u4e48, \u6240\u6709\u7684\u5b83\u90fd\u53ef\u4ee5\u5f53\u505azend_refcounted*\u7ed3\u6784\u6765\u5904\u7406.<\/p>\n<p>\u53e6\u5916\u6709\u4e00\u4e2a\u9700\u8981\u8bf4\u660e\u7684\u5c31\u662f\u5927\u5bb6\u53ef\u80fd\u4f1a\u597d\u5947\u7684ZEND_ENDIAN_LOHI_4\u5b8f, \u8fd9\u4e2a\u5b8f\u7684\u4f5c\u7528\u662f\u7b80\u5316\u8d4b\u503c, \u5b83\u4f1a\u4fdd\u8bc1\u5728\u5927\u7aef\u6216\u8005\u5c0f\u7aef\u7684\u673a\u5668\u4e0a, \u5b83\u5b9a\u4e49\u7684\u5b57\u6bb5\u90fd\u6309\u7167\u4e00\u6837\u987a\u5e8f\u6392\u5217\u5b58\u50a8, \u4ece\u800c\u6211\u4eec\u5728\u8d4b\u503c\u7684\u65f6\u5019, \u4e0d\u9700\u8981\u5bf9\u5b83\u7684\u5b57\u6bb5\u5206\u522b\u8d4b\u503c, \u800c\u662f\u53ef\u4ee5\u7edf\u4e00\u8d4b\u503c, \u6bd4\u5982\u5bf9\u4e8e\u4e0a\u9762\u7684array\u7ed3\u6784\u4e3a\u4f8b, \u5c31\u53ef\u4ee5\u901a\u8fc7:<\/p>\n<ol>\n<li>arr1<span class=\"sh_symbol\">.<\/span>u<span class=\"sh_symbol\">.<\/span>flags <span class=\"sh_symbol\">=<\/span> arr2<span class=\"sh_symbol\">.<\/span>u<span class=\"sh_symbol\">.<\/span>flags<span class=\"sh_symbol\">;<\/span><\/li>\n<\/ol>\n<p>\u4e00\u6b21\u5b8c\u6210\u76f8\u5f53\u4e8e\u5982\u4e0b\u7684\u8d4b\u503c\u5e8f\u5217:<\/p>\n<ol>\n<li>arr1<span class=\"sh_symbol\">.<\/span>u<span class=\"sh_symbol\">.<\/span>v<span class=\"sh_symbol\">.<\/span>flags\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_symbol\">=<\/span> arr2<span class=\"sh_symbol\">.<\/span>u<span class=\"sh_symbol\">.<\/span>v<span class=\"sh_symbol\">.<\/span>flags<span class=\"sh_symbol\">;<\/span><\/li>\n<li>arr1<span class=\"sh_symbol\">.<\/span>u<span class=\"sh_symbol\">.<\/span>v<span class=\"sh_symbol\">.<\/span>nApplyCount \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_symbol\">=<\/span> arr2<span class=\"sh_symbol\">.<\/span>u<span class=\"sh_symbol\">.<\/span>v<span class=\"sh_symbol\">.<\/span>nApplyCount<span class=\"sh_symbol\">;<\/span><\/li>\n<li>arr1<span class=\"sh_symbol\">.<\/span>u<span class=\"sh_symbol\">.<\/span>v<span class=\"sh_symbol\">.<\/span>nIteratorsCount\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_symbol\">=<\/span> arr2<span class=\"sh_symbol\">.<\/span>u<span class=\"sh_symbol\">.<\/span>v<span class=\"sh_symbol\">.<\/span>nIteratorsCount<span class=\"sh_symbol\">;<\/span><\/li>\n<li>arr1<span class=\"sh_symbol\">.<\/span>u<span class=\"sh_symbol\">.<\/span>v<span class=\"sh_symbol\">.<\/span>reserve \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_symbol\">=<\/span> arr2<span class=\"sh_symbol\">.<\/span>u<span class=\"sh_symbol\">.<\/span>v<span class=\"sh_symbol\">.<\/span>reserve<span class=\"sh_symbol\">;<\/span><\/li>\n<\/ol>\n<p>\u8fd8\u6709\u4e00\u4e2a\u5927\u5bb6\u53ef\u80fd\u4f1a\u95ee\u5230\u7684\u95ee\u9898\u662f, \u4e3a\u4ec0\u4e48\u4e0d\u628atype\u7c7b\u578b\u653e\u5230zval\u7c7b\u578b\u7684\u524d\u9762, \u56e0\u4e3a\u6211\u4eec\u77e5\u9053\u5f53\u6211\u4eec\u53bb\u7528\u4e00\u4e2azval\u7684\u65f6\u5019, \u9996\u5148\u7b2c\u4e00\u70b9\u80af\u5b9a\u662f\u5148\u53bb\u83b7\u53d6\u5b83\u7684\u7c7b\u578b. \u8fd9\u91cc\u7684\u4e00\u4e2a\u539f\u56e0\u662f, \u4e00\u4e2a\u662f\u4fe9\u8005\u5dee\u522b\u4e0d\u5927, \u53e6\u5916\u5c31\u662f\u8003\u8651\u5230\u5982\u679c\u4ee5\u540eJIT\u7684\u8bdd, zval\u7684\u7c7b\u578b\u5982\u679c\u80fd\u591f\u901a\u8fc7\u7c7b\u578b\u63a8\u5bfc\u83b7\u5f97, \u5c31\u6839\u672c\u6ca1\u6709\u5fc5\u8981\u53bb\u8bfb\u53d6\u5b83\u7684type\u503c\u4e86.<\/p>\n<h3>\u6807\u5fd7\u4f4d<\/h3>\n<p>\u9664\u4e86\u6570\u636e\u7c7b\u578b\u4ee5\u5916\uff0c \u4ee5\u524d\u7684\u7ecf\u9a8c\u4e5f\u544a\u8bc9\u6211\u4eec\uff0c \u4e00\u4e2a\u6570\u636e\u9664\u4e86\u5b83\u7684\u7c7b\u578b\u4ee5\u5916\uff0c \u8fd8\u5e94\u8be5\u6709\u5f88\u591a\u5176\u4ed6\u7684\u5c5e\u6027\uff0c \u6bd4\u5982\u5bf9\u4e8eINTERNED STRING\uff0c\u5b83\u662f\u4e00\u79cd\u5728\u6574\u4e2aPHP\u8bf7\u6c42\u671f\u90fd\u5b58\u5728\u7684\u5b57\u7b26\u4e32(\u6bd4\u5982\u4f60\u5199\u5728\u4ee3\u7801\u4e2d\u7684\u5b57\u9762\u91cf), \u5b83\u4e0d\u4f1a\u88ab\u5f15\u7528\u8ba1\u6570\u56de\u6536. \u57285.4\u7684\u7248\u672c\u4e2d\u6211\u4eec\u662f\u901a\u8fc7\u9884\u5148\u7533\u8bf7\u4e00\u5757\u5185\u5b58\uff0c \u7136\u540e\u518d\u8fd9\u4e2a\u5185\u5b58\u4e2d\u5206\u914d\u5b57\u7b26\u4e32\uff0c \u6700\u540e\u7528\u6307\u9488\u5730\u5740\u6765\u6bd4\u8f83\uff0c \u5982\u679c\u4e00\u4e2a\u5b57\u7b26\u4e32\u662f\u5c5e\u4e8eINTERNED STRING\u7684\u5185\u5b58\u8303\u56f4\u5185\uff0c \u5c31\u8ba4\u4e3a\u5b83\u662fINTERNED STRING. \u8fd9\u6837\u505a\u7684\u7f3a\u70b9\u663e\u800c\u6613\u89c1\uff0c \u5c31\u662f\u5f53\u5185\u5b58\u4e0d\u591f\u7684\u65f6\u5019\uff0c \u6211\u4eec\u5c31\u6ca1\u6709\u529e\u6cd5\u5206\u914dINTERNED STRING\u4e86\uff0c \u53e6\u5916\u4e5f\u975e\u5e38\u4e11\u964b\uff0c \u6240\u4ee5\u5982\u679c\u4e00\u4e2a\u5b57\u7b26\u4e32\u80fd\u6709\u4e00\u4e9b\u5c5e\u6027\u5b9a\u4e49\u5219\u8fd9\u4e2a\u5b9e\u73b0\u5c31\u53ef\u4ee5\u53d8\u5f97\u5f88\u4f18\u96c5.<\/p>\n<p>\u8fd8\u6709\uff0c \u6bd4\u5982\u73b0\u5728\u6211\u4eec\u5bf9\u4e8eIS_LONG, IS_TRUE\u7b49\u7c7b\u578b\u4e0d\u518d\u8fdb\u884c\u5f15\u7528\u8ba1\u6570\u4e86\uff0c \u90a3\u4e48\u5f53\u6211\u4eec\u62ff\u5230\u4e00\u4e2azval\u7684\u65f6\u5019\u5982\u4f55\u5224\u65ad\u5b83\u9700\u8981\u4e0d\u9700\u8981\u5f15\u7528\u8ba1\u6570\u5462\uff1f \u60f3\u5f53\u7136\u7684\u6211\u4eec\u53ef\u80fd\u4f1a\u8bf4\u7528:<\/p>\n<ol>\n<li><span class=\"sh_keyword\">if<\/span> <span class=\"sh_symbol\">(<\/span><span class=\"sh_function\">Z_TYPE_P<\/span><span class=\"sh_symbol\">(<\/span>zv<span class=\"sh_symbol\">)<\/span> <span class=\"sh_symbol\">&gt;=<\/span> IS_STRING<span class=\"sh_symbol\">)<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0\u00a0<span class=\"sh_comment\">\/\/\u9700\u8981\u5f15\u7528\u8ba1\u6570<\/span><\/li>\n<li><span class=\"sh_cbracket\">}<\/span><\/li>\n<\/ol>\n<p>\u4f46\u662f\u4f60\u5fd8\u4e86\uff0c \u8fd8\u6709INTERNED STRING\u7684\u5b58\u5728\u554a\uff0c \u6240\u4ee5\u4f60\u4e5f\u8bb8\u8981\u8fd9\u4e48\u5199\u4e86\uff1a<\/p>\n<ol>\n<li><span class=\"sh_keyword\">if<\/span> <span class=\"sh_symbol\">(<\/span><span class=\"sh_function\">Z_TYPE_P<\/span><span class=\"sh_symbol\">(<\/span>zv<span class=\"sh_symbol\">)<\/span> <span class=\"sh_symbol\">&gt;=<\/span> IS_STRING <span class=\"sh_symbol\">&amp;&amp;<\/span> <span class=\"sh_symbol\">!<\/span><span class=\"sh_function\">IS_INTERNED<\/span><span class=\"sh_symbol\">(<\/span><span class=\"sh_function\">Z_STR_P<\/span><span class=\"sh_symbol\">(<\/span>zv<span class=\"sh_symbol\">)))<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0\u00a0<span class=\"sh_comment\">\/\/\u9700\u8981\u5f15\u7528\u8ba1\u6570<\/span><\/li>\n<li><span class=\"sh_cbracket\">}<\/span><\/li>\n<\/ol>\n<p>\u662f\u4e0d\u662f\u5df2\u7ecf\u8ba9\u4f60\u611f\u89c9\u5230\u6709\u70b9\u4e0d\u5bf9\u52b2\u4e86? \u55ef\uff0c\u522b\u6025\uff0c \u8fd8\u6709\u5462\uff0c \u6211\u4eec\u8fd8\u57285.6\u7684\u65f6\u5019\u5f15\u5165\u4e86\u5e38\u91cf\u6570\u7ec4\uff0c \u8fd9\u4e2a\u6570\u7ec4\u5462\u4f1a\u5b58\u50a8\u5728Opcache\u7684\u5171\u4eab\u5185\u5b58\u4e2d\uff0c \u5b83\u4e5f\u4e0d\u9700\u8981\u5f15\u7528\u8ba1\u6570\uff1a<\/p>\n<ol>\n<li><span class=\"sh_keyword\">if<\/span> <span class=\"sh_symbol\">(<\/span><span class=\"sh_function\">Z_TYPE_P<\/span><span class=\"sh_symbol\">(<\/span>zv<span class=\"sh_symbol\">)<\/span> <span class=\"sh_symbol\">&gt;=<\/span> IS_STRING <span class=\"sh_symbol\">&amp;&amp;<\/span> <span class=\"sh_symbol\">!<\/span><span class=\"sh_function\">IS_INTERNED<\/span><span class=\"sh_symbol\">(<\/span><span class=\"sh_function\">Z_STR_P<\/span><span class=\"sh_symbol\">(<\/span>zv<span class=\"sh_symbol\">))<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_symbol\">&amp;&amp;<\/span> <span class=\"sh_symbol\">(<\/span><span class=\"sh_function\">Z_TYPE_P<\/span><span class=\"sh_symbol\">(<\/span>zv<span class=\"sh_symbol\">)<\/span> <span class=\"sh_symbol\">!=<\/span> IS_ARRAY <span class=\"sh_symbol\">||<\/span> <span class=\"sh_symbol\">!<\/span><span class=\"sh_function\">Z_IS_IMMUTABLE<\/span><span class=\"sh_symbol\">(<\/span><span class=\"sh_function\">Z_ARRVAL<\/span><span class=\"sh_symbol\">(<\/span>zv<span class=\"sh_symbol\">))))<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0<span class=\"sh_comment\">\/\/\u9700\u8981\u5f15\u7528\u8ba1\u6570<\/span><\/li>\n<li><span class=\"sh_cbracket\">}<\/span><\/li>\n<\/ol>\n<p>\u4f60\u662f\u4e0d\u662f\u4e5f\u89c9\u5f97\u8fd9\u7b80\u76f4\u592a\u4e11\u964b\u4e86\uff0c \u7b80\u76f4\u4e0d\u80fd\u5fcd\u53d7\u8fd9\u6837\u58a8\u8ff9\u7684\u4ee3\u7801\uff0c \u5bf9\u5427\uff1f<\/p>\n<p>\u662f\u7684\uff0c\u6211\u4eec\u65e9\u60f3\u5230\u4e86\uff0c\u56de\u5934\u770b\u4e4b\u524d\u7684zval\u5b9a\u4e49\uff0c \u6ce8\u610f\u5230type_flags\u4e86\u4e48? \u6211\u4eec\u5f15\u5165\u4e86\u4e00\u4e2a\u6807\u5fd7\u4f4d\uff0c \u53eb\u505aIS_TYPE_REFCOUNTED, \u5b83\u4f1a\u4fdd\u5b58\u5728zval.u1.v.type_flags\u4e2d\uff0c \u6211\u4eec\u5bf9\u4e8e\u9700\u8981\u5f15\u7528\u8ba1\u6570\u7684\u7c7b\u578b\u5c31\u8d4b\u4e88\u8fd9\u4e2a\u6807\u5fd7\uff0c \u6240\u4ee5\u4e0a\u9762\u7684\u5224\u65ad\u5c31\u53ef\u4ee5\u53d8\u5f97\u5f88\u4f18\u96c5\uff1a<\/p>\n<ol>\n<li><span class=\"sh_keyword\">if<\/span> <span class=\"sh_symbol\">(!(<\/span><span class=\"sh_function\">Z_TYPE_FLAGS<\/span><span class=\"sh_symbol\">(<\/span>zv<span class=\"sh_symbol\">)<\/span> <span class=\"sh_symbol\">&amp;<\/span> IS_TYPE_REFCOUNTED<span class=\"sh_symbol\">))<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li><span class=\"sh_cbracket\">}<\/span><\/li>\n<\/ol>\n<p>\u800c\u5bf9\u4e8eINTERNED STRING\u6765\u8bf4\uff0c \u8fd9\u4e2aIS_STR_INTERNED\u6807\u5fd7\u4f4d\u5e94\u8be5\u662f\u4f5c\u7528\u4e8e\u5b57\u7b26\u4e32\u672c\u8eab\u800c\u4e0d\u662fzval\u7684.<\/p>\n<p>\u90a3\u4e48\u7c7b\u4f3c\u8fd9\u6837\u7684\u6807\u5fd7\u4f4d\u4e00\u5171\u6709\u591a\u5c11\u5462\uff1f\u4f5c\u7528\u4e8ezval\u7684\u6709\uff1a<\/p>\n<ol>\n<li>IS_TYPE_CONSTANT <span class=\"sh_comment\">\/\/\u662f\u5e38\u91cf\u7c7b\u578b<\/span><\/li>\n<li>IS_TYPE_IMMUTABLE <span class=\"sh_comment\">\/\/\u4e0d\u53ef\u53d8\u7684\u7c7b\u578b\uff0c \u6bd4\u5982\u5b58\u5728\u5171\u4eab\u5185\u5b58\u7684\u6570\u7ec4<\/span><\/li>\n<li>IS_TYPE_REFCOUNTED <span class=\"sh_comment\">\/\/\u9700\u8981\u5f15\u7528\u8ba1\u6570\u7684\u7c7b\u578b<\/span><\/li>\n<li>IS_TYPE_COLLECTABLE <span class=\"sh_comment\">\/\/\u53ef\u80fd\u5305\u542b\u5faa\u73af\u5f15\u7528\u7684\u7c7b\u578b(IS_ARRAY, IS_OBJECT)<\/span><\/li>\n<li>IS_TYPE_COPYABLE <span class=\"sh_comment\">\/\/\u53ef\u88ab\u590d\u5236\u7684\u7c7b\u578b\uff0c \u8fd8\u8bb0\u5f97\u6211\u4e4b\u524d\u8bb2\u7684\u5bf9\u8c61\u548c\u8d44\u6e90\u7684\u4f8b\u5916\u4e48\uff1f \u5bf9\u8c61\u548c\u8d44\u6e90\u5c31\u4e0d\u662f<\/span><\/li>\n<li>IS_TYPE_SYMBOLTABLE <span class=\"sh_comment\">\/\/zval\u4fdd\u5b58\u7684\u662f\u5168\u5c40\u7b26\u53f7\u8868\uff0c \u8fd9\u4e2a\u5728\u6211\u4e4b\u524d\u505a\u4e86\u4e00\u4e2a\u8c03\u6574\u4ee5\u540e\u6ca1\u7528\u4e86\uff0c \u4f46\u8fd8\u4fdd\u7559\u7740\u517c\u5bb9\uff0c<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_comment\">\/\/\u4e0b\u4e2a\u7248\u672c\u4f1a\u53bb\u6389<\/span><\/li>\n<\/ol>\n<p>\u4f5c\u7528\u4e8e\u5b57\u7b26\u4e32\u7684\u6709:<\/p>\n<ol>\n<li>IS_STR_PERSISTENT\u00a0\u00a0\u00a0\u00a0\u00a0 <span class=\"sh_comment\">\/\/\u662fmalloc\u5206\u914d\u5185\u5b58\u7684\u5b57\u7b26\u4e32<\/span><\/li>\n<li>IS_STR_INTERNED <span class=\"sh_comment\">\/\/INTERNED STRING<\/span><\/li>\n<li>IS_STR_PERMANENT <span class=\"sh_comment\">\/\/\u4e0d\u53ef\u53d8\u7684\u5b57\u7b26\u4e32\uff0c \u7528\u4f5c\u54e8\u5175\u4f5c\u7528<\/span><\/li>\n<li>IS_STR_CONSTANT <span class=\"sh_comment\">\/\/\u4ee3\u8868\u5e38\u91cf\u7684\u5b57\u7b26\u4e32<\/span><\/li>\n<li>IS_STR_CONSTANT_UNQUALIFIED <span class=\"sh_comment\">\/\/\u5e26\u6709\u53ef\u80fd\u547d\u540d\u7a7a\u95f4\u7684\u5e38\u91cf\u5b57\u7b26\u4e32<\/span><\/li>\n<\/ol>\n<p>\u4f5c\u7528\u4e8e\u6570\u7ec4\u7684\u6709:<\/p>\n<ol>\n<li><span class=\"sh_preproc\">#define<\/span> IS_ARRAY_IMMUTABLE <span class=\"sh_comment\">\/\/\u540cIS_TYPE_IMMUTABLE<\/span><\/li>\n<\/ol>\n<p>\u4f5c\u7528\u4e8e\u5bf9\u8c61\u7684\u6709\uff1a<\/p>\n<ol>\n<li>IS_OBJ_APPLY_COUNT <span class=\"sh_comment\">\/\/\u9012\u5f52\u4fdd\u62a4<\/span><\/li>\n<li>IS_OBJ_DESTRUCTOR_CALLED <span class=\"sh_comment\">\/\/\u6790\u6784\u51fd\u6570\u5df2\u7ecf\u8c03\u7528<\/span><\/li>\n<li>IS_OBJ_FREE_CALLED <span class=\"sh_comment\">\/\/\u6e05\u7406\u51fd\u6570\u5df2\u7ecf\u8c03\u7528<\/span><\/li>\n<li>IS_OBJ_USE_GUARDS <span class=\"sh_comment\">\/\/\u9b54\u672f\u65b9\u6cd5\u9012\u5f52\u4fdd\u62a4<\/span><\/li>\n<li>IS_OBJ_HAS_GUARDS <span class=\"sh_comment\">\/\/\u662f\u5426\u6709\u9b54\u672f\u65b9\u6cd5\u9012\u5f52\u4fdd\u62a4\u6807\u5fd7<\/span><\/li>\n<\/ol>\n<p>\u6709\u4e86\u8fd9\u4e9b\u9884\u7559\u7684\u6807\u5fd7\u4f4d\uff0c \u6211\u4eec\u5c31\u4f1a\u5f88\u65b9\u4fbf\u7684\u505a\u4e00\u4e9b\u4ee5\u524d\u4e0d\u597d\u505a\u7684\u4e8b\u60c5\uff0c \u5c31\u6bd4\u5982\u6211\u81ea\u5df1\u7684Taint\u6269\u5c55\uff0c \u73b0\u5728\u628a\u4e00\u4e2a\u5b57\u7b26\u4e32\u6807\u8bb0\u4e3a\u6c61\u67d3\u7684\u5b57\u7b26\u4e32\u5c31\u4f1a\u53d8\u5f97\u65e0\u6bd4\u7b80\u5355\uff1a<\/p>\n<ol>\n<li><span class=\"sh_comment\">\/* it&#8217;s important that make sure<\/span><\/li>\n<li><span class=\"sh_comment\"> * this value is not used by Zend or<\/span><\/li>\n<li><span class=\"sh_comment\"> * any other extension agianst string *\/<\/span><\/li>\n<li><span class=\"sh_preproc\">#define<\/span> <span class=\"sh_function\">IS_STR_TAINT_POSSIBLE<\/span> <span class=\"sh_symbol\">(<\/span><span class=\"sh_number\">1<\/span><span class=\"sh_symbol\">&lt;&lt;<\/span><span class=\"sh_number\">7<\/span><span class=\"sh_symbol\">)<\/span><\/li>\n<li><span class=\"sh_preproc\">#define<\/span> <span class=\"sh_function\">TAINT_MARK<\/span><span class=\"sh_symbol\">(<\/span>str<span class=\"sh_symbol\">)<\/span> <span class=\"sh_symbol\">(<\/span><span class=\"sh_function\">GC_FLAGS<\/span><span class=\"sh_symbol\">((<\/span>str<span class=\"sh_symbol\">))<\/span> <span class=\"sh_symbol\">|=<\/span> IS_STR_TAINT_POSSIBLE<span class=\"sh_symbol\">)<\/span><\/li>\n<\/ol>\n<p>\u8fd9\u4e2a\u6807\u8bb0\u5c31\u4f1a\u4e00\u76f4\u968f\u7740\u8fd9\u4e2a\u5b57\u7b26\u4e32\u7684\u751f\u5b58\u800c\u5b58\u5728\u7684\uff0c \u7701\u6389\u4e86\u6211\u4e4b\u524d\u7684\u5f88\u591atricky\u7684\u505a\u6cd5.<\/p>\n<h3>zval\u9884\u5148\u5206\u914d<\/h3>\n<p>\u524d\u9762\u6211\u4eec\u8bf4\u8fc7, PHP5\u7684zval\u5206\u914d\u91c7\u7528\u7684\u662f\u5806\u4e0a\u5206\u914d\u5185\u5b58, \u4e5f\u5c31\u662f\u5728PHP\u9884\u6848\u4ee3\u7801\u4e2d\u968f\u5904\u53ef\u89c1\u7684MAKE_STD_ZVAL\u548cALLOC_ZVAL\u5b8f. \u6211\u4eec\u4e5f\u77e5\u9053\u4e86\u672c\u6765\u4e00\u4e2azval\u53ea\u9700\u898124\u4e2a\u5b57\u8282, \u4f46\u662f\u7b97\u4e0agc_info, \u5176\u5b9e\u5206\u914d\u4e8632\u4e2a\u5b57\u8282, \u518d\u52a0\u4e0aPHP\u81ea\u5df1\u7684\u5185\u5b58\u7ba1\u7406\u5728\u5206\u914d\u5185\u5b58\u7684\u65f6\u5019\u90fd\u4f1a\u5728\u5185\u5b58\u524d\u9762\u4fdd\u7559\u4e00\u90e8\u5206\u4fe1\u606f:<\/p>\n<ol>\n<li><span class=\"sh_keyword\">typedef<\/span> <span class=\"sh_keyword\">struct<\/span> <span class=\"sh_classname\">_zend_mm_block<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_mm_block_info<\/span> info<span class=\"sh_symbol\">;<\/span><\/li>\n<li><span class=\"sh_preproc\">#if<\/span> ZEND_DEBUG<\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_type\">unsigned<\/span> <span class=\"sh_type\">int<\/span> magic<span class=\"sh_symbol\">;<\/span><\/li>\n<li><span class=\"sh_preproc\"># ifdef<\/span> ZTS<\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">THREAD_T<\/span> thread_id<span class=\"sh_symbol\">;<\/span><\/li>\n<li><span class=\"sh_preproc\"># endif<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_mm_debug_info<\/span> debug<span class=\"sh_symbol\">;<\/span><\/li>\n<li><span class=\"sh_preproc\">#elif<\/span> ZEND_MM_HEAP_PROTECTION<\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_usertype\">zend_mm_debug_info<\/span> debug<span class=\"sh_symbol\">;<\/span><\/li>\n<li><span class=\"sh_preproc\">#endif<\/span><\/li>\n<li><span class=\"sh_cbracket\">}<\/span> zend_mm_block<span class=\"sh_symbol\">;<\/span><\/li>\n<\/ol>\n<p>\u4ece\u800c\u5bfc\u81f4\u5b9e\u9645\u4e0a\u6211\u4eec\u53ea\u9700\u898124\u5b57\u8282\u7684\u5185\u5b58, \u4f46\u6700\u540e\u7adf\u7136\u5206\u914d48\u4e2a\u5b57\u8282\u4e4b\u591a.<\/p>\n<p>\u7136\u800c\u5927\u90e8\u5206\u7684zval, \u5c24\u5176\u662f\u6269\u5c55\u51fd\u6570\u5185\u7684zval, \u6211\u4eec\u60f3\u60f3\u5b83\u63a5\u53d7\u7684\u53c2\u6570\u6765\u81ea\u5916\u90e8\u7684zval, \u5b83\u628a\u8fd4\u56de\u503c\u8fd4\u56de\u7ed9return_value, \u8fd9\u4e2a\u4e5f\u662f\u6765\u81ea\u5916\u90e8\u7684zval, \u800c\u4e2d\u95f4\u53d8\u91cf\u7684zval\u5b8c\u5168\u53ef\u4ee5\u91c7\u7528\u6808\u4e0a\u5206\u914d. \u4e5f\u5c31\u662f\u8bf4\u5927\u90e8\u5206\u7684\u5185\u90e8\u51fd\u6570\u90fd\u4e0d\u9700\u8981\u5728\u5806\u4e0a\u5206\u914d\u5185\u5b58, \u5b83\u9700\u8981\u7684zval\u90fd\u53ef\u4ee5\u6765\u81ea\u5916\u90e8.<\/p>\n<p>\u4e8e\u662f\u5f53\u65f6\u6211\u4eec\u505a\u4e86\u4e00\u4e2a\u5927\u80c6\u7684\u60f3\u6cd5, \u6240\u6709\u7684zval\u90fd\u4e0d\u9700\u8981\u5355\u72ec\u7533\u8bf7.<\/p>\n<p>\u800c\u8fd9\u4e2a\u4e5f\u5f88\u5bb9\u6613\u8bc1\u660e, PHP\u811a\u672c\u4e2d\u4f7f\u7528\u7684zval, \u8981\u4e48\u5b58\u5728\u4e8e\u7b26\u53f7\u8868, \u8981\u4e48\u5c31\u4ee5\u4e34\u65f6\u53d8\u91cf(IS_TMP_VAR)\u6216\u8005\u7f16\u8bd1\u53d8\u91cf(IS_CV)\u7684\u5f62\u5f0f\u5b58\u5728. \u524d\u8005\u5b58\u5728\u4e8e\u4e00\u4e2aHashtable\u4e2d, \u800c\u5728PHP7\u4e2dHashtable\u9ed8\u8ba4\u4fdd\u5b58\u7684\u5c31\u662fzval, \u8fd9\u90e8\u5206\u7684zval\u5b8c\u5168\u53ef\u4ee5\u5728Hashtable\u5206\u914d\u7684\u65f6\u5019\u4e00\u6b21\u6027\u5206\u914d\u51fa\u6765, \u540e\u9762\u7684\u5b58\u5728\u4e8eexecute_data\u4e4b\u540e, \u6570\u91cf\u4e5f\u5728\u7f16\u8bd1\u65f6\u523b\u786e\u5b9a\u597d\u4e86, \u4e5f\u53ef\u4ee5\u968f\u7740execute_data\u4e00\u6b21\u6027\u5206\u914d, \u6240\u4ee5\u6211\u4eec\u786e\u5b9e\u4e0d\u518d\u9700\u8981\u5355\u72ec\u5728\u5806\u4e0a\u7533\u8bf7zval\u4e86.<\/p>\n<p>\u6240\u4ee5, \u5728PHP7\u5f00\u59cb, \u6211\u4eec\u79fb\u9664\u4e86MAKE_STD_ZVAL\/ALLOC_ZVAL\u5b8f, \u4e0d\u518d\u652f\u6301\u5b58\u5806\u5185\u5b58\u4e0a\u7533\u8bf7zval. \u51fd\u6570\u5185\u90e8\u4f7f\u7528\u7684zval\u8981\u4e48\u6765\u81ea\u5916\u9762\u8f93\u5165, \u8981\u4e48\u4f7f\u7528\u5728\u6808\u4e0a\u5206\u914d\u7684\u4e34\u65f6zval.<\/p>\n<p>\u5728\u540e\u6765\u7684\u5b9e\u8df5\u4e2d, \u603b\u7ed3\u51fa\u6765\u7684\u53ef\u80fd\u5bf9\u4e8e\u5f00\u53d1\u8005\u6765\u8bf4\u6700\u5927\u7684\u53d8\u5316\u5c31\u662f, \u4e4b\u524d\u7684\u4e00\u4e9b\u5185\u90e8\u51fd\u6570, \u901a\u8fc7\u4e00\u4e9b\u64cd\u4f5c\u83b7\u5f97\u4e00\u4e9b\u4fe1\u606f, \u7136\u540e\u5206\u914d\u4e00\u4e2azval, \u8fd4\u56de\u7ed9\u8c03\u7528\u8005\u7684\u60c5\u51b5:<\/p>\n<ol>\n<li><span class=\"sh_keyword\">static<\/span> zval <span class=\"sh_symbol\">*<\/span> <span class=\"sh_function\">php_internal_function<\/span><span class=\"sh_symbol\">()<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_symbol\">&#8230;..<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0str <span class=\"sh_symbol\">=<\/span> <span class=\"sh_function\">external_function<\/span><span class=\"sh_symbol\">();<\/span><\/li>\n<li><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_function\">MAKE_STD_ZVAL<\/span><span class=\"sh_symbol\">(<\/span>zv<span class=\"sh_symbol\">);<\/span><\/li>\n<li><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_function\">ZVAL_STRING<\/span><span class=\"sh_symbol\">(<\/span>zv<span class=\"sh_symbol\">,<\/span> str<span class=\"sh_symbol\">,<\/span> <span class=\"sh_number\">0<\/span><span class=\"sh_symbol\">);<\/span><\/li>\n<li><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_keyword\">return<\/span> zv<span class=\"sh_symbol\">;<\/span><\/li>\n<li><span class=\"sh_cbracket\">}<\/span><\/li>\n<li><span class=\"sh_function\">PHP_FUNCTION<\/span><span class=\"sh_symbol\">(<\/span>test<span class=\"sh_symbol\">)<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_function\">RETURN_ZVAL<\/span><span class=\"sh_symbol\">(<\/span><span class=\"sh_function\">php_internal_function<\/span><span class=\"sh_symbol\">(),<\/span> <span class=\"sh_number\">1<\/span><span class=\"sh_symbol\">,<\/span> <span class=\"sh_number\">1<\/span><span class=\"sh_symbol\">);<\/span><\/li>\n<li><span class=\"sh_cbracket\">}<\/span><\/li>\n<\/ol>\n<p>\u8981\u4e48\u4fee\u6539\u4e3a, \u8fd9\u4e2azval\u7531\u8c03\u7528\u8005\u4f20\u9012:<\/p>\n<ol>\n<li><span class=\"sh_keyword\">static<\/span> <span class=\"sh_type\">void<\/span> <span class=\"sh_function\">php_internal_function<\/span><span class=\"sh_symbol\">(<\/span><span class=\"sh_usertype\">zval<\/span> <span class=\"sh_symbol\">*<\/span>zv<span class=\"sh_symbol\">)<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_symbol\">&#8230;..<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0str <span class=\"sh_symbol\">=<\/span> <span class=\"sh_function\">external_function<\/span><span class=\"sh_symbol\">();<\/span><\/li>\n<li><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_function\">ZVAL_STRING<\/span><span class=\"sh_symbol\">(<\/span>zv<span class=\"sh_symbol\">,<\/span> str<span class=\"sh_symbol\">);<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_function\">efree<\/span><span class=\"sh_symbol\">(<\/span>str<span class=\"sh_symbol\">);<\/span><\/li>\n<li><span class=\"sh_cbracket\">}<\/span><\/li>\n<li><\/li>\n<li><span class=\"sh_function\">PHP_FUNCTION<\/span><span class=\"sh_symbol\">(<\/span>test<span class=\"sh_symbol\">)<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_function\">php_internal_function<\/span><span class=\"sh_symbol\">(<\/span>return_value<span class=\"sh_symbol\">);<\/span><\/li>\n<li><span class=\"sh_cbracket\">}<\/span><\/li>\n<\/ol>\n<p>\u8981\u4e48\u4fee\u6539\u4e3a, \u8fd9\u4e2a\u51fd\u6570\u8fd4\u56de\u539f\u59cb\u7d20\u6750:<\/p>\n<ol>\n<li><span class=\"sh_keyword\">static<\/span> <span class=\"sh_type\">char<\/span> <span class=\"sh_symbol\">*<\/span> <span class=\"sh_function\">php_internal_function<\/span><span class=\"sh_symbol\">()<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0<span class=\"sh_symbol\">&#8230;..<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0str <span class=\"sh_symbol\">=<\/span> <span class=\"sh_function\">external_function<\/span><span class=\"sh_symbol\">();<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_keyword\">return<\/span> str<span class=\"sh_symbol\">;<\/span><\/li>\n<li><span class=\"sh_cbracket\">}<\/span><\/li>\n<li><\/li>\n<li><span class=\"sh_function\">PHP_FUNCTION<\/span><span class=\"sh_symbol\">(<\/span>test<span class=\"sh_symbol\">)<\/span> <span class=\"sh_cbracket\">{<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0str <span class=\"sh_symbol\">=<\/span> <span class=\"sh_function\">php_internal_function<\/span><span class=\"sh_symbol\">();<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_function\">RETURN_STRING<\/span><span class=\"sh_symbol\">(<\/span>str<span class=\"sh_symbol\">);<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"sh_function\">efree<\/span><span class=\"sh_symbol\">(<\/span>str<span class=\"sh_symbol\">);<\/span><\/li>\n<li><span class=\"sh_cbracket\">}<\/span><\/li>\n<\/ol>\n<h3>\u603b\u7ed3<\/h3>\n<p>(\u8fd9\u5757\u8fd8\u6ca1\u60f3\u597d\u600e\u4e48\u8bf4, \u672c\u6765\u6211\u662f\u8981\u5f15\u51faHashtable\u4e0d\u518d\u5b58\u5728zval**, \u4ece\u800c\u5f15\u51fa\u5f15\u7528\u7c7b\u578b\u7684\u5b58\u5728\u7684\u5fc5\u8981\u6027, \u4f46\u662f\u5982\u679c\u4e0d\u5148\u8bb2Hashtable\u7684\u7ed3\u6784, \u8fd9\u4e2a\u5f15\u51fa\u8c8c\u4f3c\u5f88\u7a81\u5140, \u5148\u8fd9\u4e48\u7740\u5427, \u4ee5\u540e\u518d\u6765\u4fee\u6539)<\/p>\n<p>\u5230\u73b0\u5728\u6211\u4eec\u57fa\u672c\u4e0a\u628azval\u7684\u53d8\u5316\u6982\u51b5\u4ecb\u7ecd\u5b8c\u6bd5, \u62bd\u8c61\u7684\u6765\u8bf4, \u5176\u5b9e\u5728PHP7\u4e2d\u7684zval, \u5df2\u7ecf\u53d8\u6210\u4e86\u4e00\u4e2a\u503c\u6307\u9488, \u5b83\u8981\u4e48\u4fdd\u5b58\u7740\u539f\u59cb\u503c, \u8981\u4e48\u4fdd\u5b58\u7740\u6307\u5411\u4e00\u4e2a\u4fdd\u5b58\u539f\u59cb\u503c\u7684\u6307\u9488. \u4e5f\u5c31\u662f\u8bf4\u73b0\u5728\u7684zval\u76f8\u5f53\u4e8ePHP5\u7684\u65f6\u5019\u7684zval *. \u53ea\u4e0d\u8fc7\u76f8\u6bd4\u4e8ezval *, \u76f4\u63a5\u5b58\u50a8zval, \u6211\u4eec\u53ef\u4ee5\u7701\u6389\u4e00\u6b21\u6307\u9488\u89e3\u5f15\u7528, \u4ece\u800c\u63d0\u9ad8\u7f13\u5b58\u53cb\u597d\u6027.<\/p>\n<p>\u5176\u5b9ePHP7\u7684\u6027\u80fd, \u6211\u4eec\u5e76\u6ca1\u6709\u5f15\u5165\u4ec0\u4e48\u65b0\u7684\u6280\u672f\u6a21\u5f0f, \u4e0d\u8fc7\u5c31\u662f\u4e3b\u8981\u6765\u81ea, \u6301\u7eed\u4e0d\u61c8\u7684\u964d\u4f4e\u5185\u5b58\u5360\u7528, \u63d0\u9ad8\u7f13\u5b58\u53cb\u597d\u6027, \u964d\u4f4e\u6267\u884c\u7684\u6307\u4ee4\u6570\u7684\u8fd9\u4e9b\u539f\u5219\u800c\u6765\u7684, \u53ef\u4ee5\u8bf4PHP7\u7684\u91cd\u6784\u5c31\u662f\u8fd9\u4e09\u4e2a\u539f\u5219.<\/p>\n<div class=\"rp4wp-related-posts\">\n<h3>Related Posts<\/h3>\n<ul>\n<li>\n<div class=\"rp4wp-related-post-content\"><a href=\"http:\/\/www.laruence.com\/2008\/07\/16\/225.html\">Zend 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