{"id":30902,"date":"2022-07-19T05:09:05","date_gmt":"2023-07-27T20:51:49","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%a5%bd%e7%8e%a9%e7%9a%84php%ef%bc%88%e7%99%bd%e7%9c%bc%ef%bc%89\/"},"modified":"2025-08-12T21:18:55","modified_gmt":"2025-08-12T13:18:55","slug":"%e5%a5%bd%e7%8e%a9%e7%9a%84php%ef%bc%88%e7%99%bd%e7%9c%bc%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%a5%bd%e7%8e%a9%e7%9a%84php%ef%bc%88%e7%99%bd%e7%9c%bc%ef%bc%89\/","title":{"rendered":"\u597d\u73a9\u7684PHP\uff08\u767d\u773c\uff09"},"content":{"rendered":"

\u5927\u5bb6\u5728\u4eab\u53d7\u6109\u5feb\u7684PHP\u751f\u6d3b\u5417\uff1f<\/p>\n

\uff3c\u592a\u5f00\u5fc3\u5566\uff01\uff0f\uff3c\u6211\u8d85\u559c\u6b22PHP\uff0f\uff3c\u6211\u7231PHP\uff0f<\/p>\n

\u6211\u542c\u5230\u5f88\u591a\u58f0\u97f3\u3002
\n\u59d0\u59d0\uff0c\u6211\u975e\u5e38\u5f00\u5fc3\uff01
\n\u4f46\u662f\uff0c\u867d\u7136\u4f60\u559c\u6b22PHP\uff0c\u4f46\u5b9e\u9645\u4e0a\u5b83\u53ef\u80fd\u4f1a\u6709\u4e00\u4e9b\u610f\u60f3\u4e0d\u5230\u7684\u884c\u4e3a\u54e6\u3002
\n\u6216\u8005\u4e3a\u4ec0\u4e48\u8fd9\u6837\u7b80\u5355\u7684\u5904\u7406\u5374\u5403\u6389\u8fd9\u4e48\u591a\u5185\u5b58\u5462\uff1f
\n\u4f60\u6709\u8fc7\u7c7b\u4f3c\u7684\u7ecf\u5386\u5417\uff1f<\/p>\n

\u4e5f\u8bb8\u5728\u9605\u8bfb\u8fd9\u7bc7\u6587\u7ae0\u540e\uff0c\u60a8\u66fe\u7ecf\u559c\u7231\u7684PHP\u4f1a\u53d8\u5f97\u8ba8\u538c\uff0c\u60a8\u53ef\u80fd\u60f3\u8981\u548c\u5b83\u5206\u9053\u626c\u9573\u3002
\n\u6216\u8005\u76f8\u53cd\uff0c\u60a8\u4e5f\u53ef\u80fd\u4f1a\u53d8\u5f97\u66f4\u52a0\u559c\u6b22\u5b83\u3002
\n\u8fd9\u53d6\u51b3\u4e8e\u60a8\u81ea\u5df1\u3002<\/p>\n

\u5f00\u59cb\u65f6\u6211\u4f1a\u7528\u8fd9\u6837\u7684\u5b57\u773c\u5f00\u573a\uff0c\u4f46\u5b9e\u9645\u4e0a\u5e76\u6ca1\u6709\u4ec0\u4e48\u5185\u5bb9\u3002\u7b80\u5355\u6765\u8bf4\uff0c\u8fd9\u53ea\u662f\u4e00\u4e2a\u5f15\u4eba\u70b9\u51fb\u7684\u624b\u6cd5\u3002
\n\u7531\u4e8e\u6807\u9898\u672c\u8eab\u5df2\u7ecf\u5305\u542b\u4e86\u5168\u90e8\u7684\u4fe1\u606f\uff0c\u6240\u4ee5\u60a8\u4e0d\u9700\u8981\u9605\u8bfb\u63a5\u4e0b\u6765\u7684\u5185\u5bb9\u3002
\n\u597d\uff0c\u90a3\u6211\u4eec\u5c31\u5f00\u59cb\u5427\u3002<\/p>\n

\u5728\u64b0\u5199\u672c\u6587\u65f6\u6240\u4f7f\u7528\u7684PHP\u7248\u672c\u5982\u4e0b\uff1a
\nPHP 7.1.3\uff08cli\uff09\uff08\u6784\u5efa\u65e5\u671f\uff1a2017\u5e743\u670814\u65e517:39:59\uff09\uff08NTS\u7248\uff09
\n\u7248\u6743\u6240\u6709\uff08c\uff091997-2017 PHP\u56e2\u961f
\nZend Engine v3.1.0\uff0c\u7248\u6743\u6240\u6709\uff08c\uff091998-2017 Zend Tech<\/p>\n

\u9996\u5148\u5728\u5176\u4ed6\u8bed\u8a00\u4e2d\u666e\u904d\u9002\u7528\u7684\u89c4\u5219\uff0c\u5728PHP\u4e2d\u53ef\u80fd\u53d8\u5f97\u4e0d\u9002\u7528\u3002\u53cd\u8fc7\u6765\u8bf4\uff0c\u5982\u679cPHP\u662f\u7b2c\u4e00\u6b21\u63a5\u89e6\u7684\u8bed\u8a00\uff0c\u8fd9\u4e9b\u95ee\u9898\u53ef\u80fd\u4e0d\u4f1a\u6210\u4e3a\u56f0\u6270\u3002\u4f46\u5b9e\u9645\u4e0a\uff0c\u6709\u4e00\u4e9b\u60c5\u51b5\u662f\u5176\u4ed6\u8bed\u8a00\u5b66\u4e60\u8005\u63a5\u89e6PHP\u65f6\u4f1a\u9047\u5230\u8f83\u5927\u7684\u56f0\u96be\u548c\u632b\u6298\u3002\u6211\u8981\u5148\u5927\u58f0\u8bf4\u51fa\u6765\u7684\u662f\uff0c<\/p>\n

PHP \u662f\u4e00\u79cd\u811a\u672c\u8bed\u8a00\u3002<\/p>\n

\u8303\u56f4\u7684\u4e8b\u60c5PHP\u7684\u4f5c\u7528\u57df\u5728\u67d0\u79cd\u7a0b\u5ea6\u4e0a\u662f\u88c5\u9970\u54c1\u3002\u5bf9\u4e8e\u9ad8\u624b\u6765\u8bf4\uff0c\u4ed6\u4eec\u65e0\u6cd5\u7406\u89e3\u5b83\u3002<\/p>\n
<?php<\/span>\r\nfunction<\/span> test<\/span>()<\/span>\r\n{<\/span>\r\n    {<\/span>\r\n        $value<\/span> =<\/span> \"hello world<\/span>\\n<\/span>\"<\/span>;<\/span>\r\n        echo<\/span> $value<\/span>;<\/span>\r\n    }<\/span>\r\n    echo<\/span> $value<\/span>;<\/span>\r\n}<\/span>\r\ntest<\/span>();<\/span>\r\n<\/code><\/pre>\n
\u6267\u884c\u65f6<\/p>\n
\u4f60\u597d\u4e16\u754c
\n\u4f60\u597d\u4e16\u754c<\/p><\/blockquote>\n
\u9019\u662f<\/p>\n
\u8ba1\u7b97\u673a\u7b97\u6cd5\u76f8\u5173\u6570\u5b57\u5c31\u662f\u6570\u5b57\u3002\u5b83\u4e0d\u662f\u5b57\u7b26\u4e32\u7c7b\u578b\u6216\u6570\u503c\u7c7b\u578b\uff0c\u53ea\u662f\u6570\u5b57\u3002<\/p>\n
<?php<\/span>\r\n\r\nfunction<\/span> test<\/span>()<\/span>\r\n{<\/span>\r\n    echo<\/span> \"3\"<\/span> +<\/span> 9<\/span> .<\/span> \"<\/span>\\n<\/span>\"<\/span>;<\/span>\r\n    echo<\/span> \"3\"<\/span> +<\/span> \"9\"<\/span> .<\/span> \"<\/span>\\n<\/span>\"<\/span>;<\/span>\r\n    echo<\/span> \"3\"<\/span> .<\/span> 9<\/span> .<\/span> \"<\/span>\\n<\/span>\"<\/span>;<\/span>\r\n    echo<\/span> 3<\/span> .<\/span> 9<\/span> .<\/span> \"<\/span>\\n<\/span>\"<\/span>;<\/span>\r\n}<\/span>\r\ntest<\/span>();<\/span>\r\n<\/code><\/pre>\n
\u4e00\u65e6\u6267\u884c<\/p>\n
12
\n\u5341\u4e8c
\n39
\n\u4e09\u5341\u4e5d<\/p><\/blockquote>\n
\u5728\u4e2d\u56fd\uff0c\u6709\u4ee5\u4e0b\u7684\u4e00\u4e2a\u9009\u9879\uff1a\u662f\u7684\u3002<\/p>\n
\u7a7a \u7684\u4e8b\u60c5
\n\u4e2a\u4eba\u8ba4\u4e3a\u4e0d\u5e94\u8be5\u7ecf\u5e38\u4f7f\u7528null\u3002\u4e0e\u5176\u4f7f\u7528null\u6765\u5224\u65ad\u5bf9\u8c61\u662f\u5426\u4e3a\u7a7a\uff0c\u4e0d\u5982\u901a\u8fc7\u4f7f\u7528unset\u6765\u5220\u9664\u4e0d\u9700\u8981\u7684\u5bf9\u8c61\uff0c\u5e76\u4f7f\u7528\u5982isset\u7b49\u51fd\u6570\u6765\u5224\u65ad\u5bf9\u8c61\u662f\u5426\u6709\u6548\u3002<\/p>\n
<?php<\/span>\r\n\r\nfunction<\/span> test_isset<\/span>()<\/span>\r\n{<\/span>\r\n    $value<\/span> =<\/span> \"aaaa\"<\/span>;<\/span>\r\n    echo<\/span> (<\/span>isset<\/span>(<\/span>$value<\/span>)<\/span>?<\/span>1<\/span>:<\/span>0<\/span>)<\/span> .<\/span>\"<\/span>\\n<\/span>\"<\/span>;<\/span>\r\n    $value<\/span> =<\/span> null<\/span>;<\/span>\r\n    echo<\/span> (<\/span>isset<\/span>(<\/span>$value<\/span>)<\/span>?<\/span>1<\/span>:<\/span>0<\/span>)<\/span> .<\/span>\"<\/span>\\n<\/span>\"<\/span>;<\/span>\r\n    $value<\/span> =<\/span> \"aaaa\"<\/span>;<\/span>\r\n    unset<\/span>(<\/span>$value<\/span>);<\/span>\r\n    echo<\/span> (<\/span>isset<\/span>(<\/span>$value<\/span>)<\/span>?<\/span>1<\/span>:<\/span>0<\/span>)<\/span> .<\/span>\"<\/span>\\n<\/span>\"<\/span>;<\/span>\r\n}<\/span>\r\n\r\nfunction<\/span> test_isnull<\/span>()<\/span>\r\n{<\/span>\r\n    $value<\/span> =<\/span> \"aaaa\"<\/span>;<\/span>\r\n    echo<\/span> (<\/span>!<\/span>is_null<\/span>(<\/span>$value<\/span>)<\/span>?<\/span>1<\/span>:<\/span>0<\/span>)<\/span> .<\/span>\"<\/span>\\n<\/span>\"<\/span>;<\/span>\r\n    $value<\/span> =<\/span> null<\/span>;<\/span>\r\n    echo<\/span> (<\/span>!<\/span>is_null<\/span>(<\/span>$value<\/span>)<\/span>?<\/span>1<\/span>:<\/span>0<\/span>)<\/span> .<\/span>\"<\/span>\\n<\/span>\"<\/span>;<\/span>\r\n    $value<\/span> =<\/span> \"aaaa\"<\/span>;<\/span>\r\n    unset<\/span>(<\/span>$value<\/span>);<\/span>\r\n    echo<\/span> (<\/span>!<\/span>is_null<\/span>(<\/span>$value<\/span>)<\/span>?<\/span>1<\/span>:<\/span>0<\/span>)<\/span> .<\/span>\"<\/span>\\n<\/span>\"<\/span>;<\/span>\r\n}<\/span>\r\n\r\n\r\nfunction<\/span> test_isset2<\/span>()<\/span>\r\n{<\/span>\r\n    echo<\/span> (<\/span>isset<\/span>(<\/span>$value<\/span>)<\/span>?<\/span>1<\/span>:<\/span>0<\/span>)<\/span> .<\/span>\"<\/span>\\n<\/span>\"<\/span>;<\/span>\r\n    $value<\/span> =<\/span> null<\/span>;<\/span>\r\n    echo<\/span> (<\/span>isset<\/span>(<\/span>$value<\/span>)<\/span>?<\/span>1<\/span>:<\/span>0<\/span>)<\/span> .<\/span>\"<\/span>\\n<\/span>\"<\/span>;<\/span>\r\n}<\/span>\r\n\r\nfunction<\/span> test_isnull2<\/span>()<\/span>\r\n{<\/span>\r\n    echo<\/span> (<\/span>!<\/span>is_null<\/span>(<\/span>$value<\/span>)<\/span>?<\/span>1<\/span>:<\/span>0<\/span>)<\/span> .<\/span>\"<\/span>\\n<\/span>\"<\/span>;<\/span>\r\n    $value<\/span> =<\/span> null<\/span>;<\/span>\r\n    echo<\/span> (<\/span>!<\/span>is_null<\/span>(<\/span>$value<\/span>)<\/span>?<\/span>1<\/span>:<\/span>0<\/span>)<\/span> .<\/span>\"<\/span>\\n<\/span>\"<\/span>;<\/span>\r\n}<\/span>\r\n\r\n<\/code><\/pre>\n
\u6267\u884c\u7ed3\u679c\u5982\u4e0b<\/p>\n
test_isset ———————-
\n1
\n0
\n0
\n\u68c0\u6d4b_isset ———————-
\n1
\n0
\n0
\nPHP \u6ce8\u610f\uff1a\u53d8\u91cf value \u5728 test.php \u7b2c22\u884c\u672a\u5b9a\u4e49
\n0
\n\u68c0\u6d4b_isnull ———————-
\n1
\n0
\n\u68c0\u6d4b_isset2 ———————-
\n0
\n0
\n\u68c0\u6d4b_isnull2———————-
\nPHP \u6ce8\u610f\uff1a\u53d8\u91cf value \u5728 test.php \u7b2c35\u884c\u672a\u5b9a\u4e49
\n0
\n0<\/p><\/blockquote>\n
\u53c2\u8003\u662f\u90aa\u6076\u7684<\/p>\n
<?php<\/span>\r\nfunction<\/span> test<\/span>()<\/span>\r\n{<\/span>\r\n    $values<\/span> =<\/span> array<\/span>(<\/span>1<\/span>,<\/span>2<\/span>,<\/span>3<\/span>,<\/span>4<\/span>,<\/span>5<\/span>);<\/span>\r\n    foreach<\/span> (<\/span> $values<\/span> as<\/span> &<\/span>$value<\/span> )<\/span>\r\n    {<\/span>\r\n        echo<\/span> $value<\/span>.<\/span>\",\"<\/span>;<\/span>\r\n    }<\/span>\r\n    echo<\/span> \"<\/span>\\n<\/span>\"<\/span>;<\/span>\r\n    $value<\/span> =<\/span> 999<\/span>;<\/span>\r\n    foreach<\/span> (<\/span> $values<\/span> as<\/span> &<\/span>$value<\/span> )<\/span>\r\n    {<\/span>\r\n        echo<\/span> $value<\/span>.<\/span>\",\"<\/span>;<\/span>\r\n    }<\/span>\r\n    echo<\/span> \"<\/span>\\n<\/span>\"<\/span>;<\/span>\r\n}<\/span>\r\ntest<\/span>();<\/span>\r\n<\/code><\/pre>\n
\u4e00\u65e6\u6267\u884c<\/p>\n
\u4e00\u3001\u4e8c\u3001\u4e09\u3001\u56db\u3001\u4e94
\n\u4e00\u3001\u4e8c\u3001\u4e09\u3001\u56db\u3001\u4e5d\u4e5d\u4e5d<\/p><\/blockquote>\n
\u8bf7\u95ee\u60a8\u662f\u5426\u660e\u767d\u6570\u53ef\u5426\uff1f<\/p>\n
\u6ce8\u91cd\u5199\u4f5c\u65f6\u7684\u300c\u5199\u65f6\u590d\u5236\u300d\u65b9\u5f0f
\n\u7531\u4e8ePHP\u7684copy on write\u7279\u6027\uff0c\u901a\u5e38\u5904\u7406\u65f6\u6309\u5f15\u7528\u65b9\u5f0f\u5904\u7406\uff08\u975e\u590d\u5236\uff09\u3002\u4e00\u65e6\u53d1\u751f\u66f4\u6539\uff0c\u5c06\u8fdb\u884c\u590d\u5236\u64cd\u4f5c\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u539f\u672c\u63d0\u5230\u7684\u5f15\u7528\u5728PHP\u4e2d\u90fd\u662f\u53ef\u4ee5\u88ab\u6392\u9664\u7684\u3002\u4e0e\u5176\u4ed6\u8bed\u8a00\u4e0d\u540c\uff0c\u5728PHP\u4e2d\uff0c\u66f4\u6ce8\u91cdcopy on write\u7684\u8bbe\u8ba1\uff0c\u800c\u4e0d\u662f\u901a\u8fc7\u5f15\u7528\u4f20\u9012\u503c\uff0c\u53ef\u4ee5\u7f16\u5199\u51fa\u6267\u884c\u901f\u5ea6\u548c\u5185\u5b58\u4f7f\u7528\u91cf\u6709\u4f18\u52bf\u7684\u4ee3\u7801\u3002<\/p>\n
\u867d\u7136\u6709\u70b9\u9ebb\u70e6\uff0c\u4f46\u53ef\u4ee5\u5c06\u901a\u5e38\u7684\u503c\u6570\u7ec4\u5c01\u88c5\u4e3a\u7c7b\uff0c\u5e76\u5728\u4f20\u9012\u5230\u76ee\u6807\u4f4d\u7f6e\u540e\u4fee\u6539\u6210\u5458\u53d8\u91cf\u3002
\n\u901a\u8fc7\u8fd9\u79cd\u5199\u6cd5\uff0c\u53ef\u4ee5\u5b9e\u73b0\u7c7b\u4f3c\u5f15\u7528\u7684\u884c\u4e3a\u3002
\n\u4e2a\u4eba\u8ba4\u4e3a\uff0c\u8fc7\u4e8e\u8f7b\u6613\u5730\u4f7f\u7528\u5f15\u7528\u6765\u907f\u514d\u95ee\u9898\u662f\u4e0d\u597d\u7684\u505a\u6cd5\u3002<\/p>\n
\u9996\u5148\uff0c\u8ba9\u6211\u4eec\u901a\u8fc7\u4e00\u4e2a\u793a\u4f8b\u6765\u89e3\u91ca\u4e00\u4e0b\u4ec0\u4e48\u662f\u201c\u610f\u8bc6\u5230copy on write\u201d\u3002<\/p>\n
<?php<\/span>\r\n\r\nfunction<\/span> test1<\/span>()<\/span>\r\n{<\/span>\r\n    $sc<\/span> =<\/span> new<\/span> stdClass<\/span>();<\/span>\r\n\r\n    $sc<\/span>-><\/span>ary<\/span> =<\/span> array_fill<\/span>(<\/span>0<\/span>,<\/span> 999999<\/span>,<\/span> \"aaaa\"<\/span>);<\/span>\r\n\r\n    echo<\/span> number_format<\/span>(<\/span>memory_get_usage<\/span>())<\/span> .<\/span> \"byte <\/span>\\n<\/span>\"<\/span>;<\/span>\r\n}<\/span>\r\n\r\nfunction<\/span> test2<\/span>()<\/span>\r\n{<\/span>\r\n    $array_a<\/span> =<\/span> array_fill<\/span>(<\/span>0<\/span>,<\/span> 999999<\/span>,<\/span> \"aaaa\"<\/span>);<\/span>\r\n\r\n    $array_b<\/span> =<\/span> $array_a<\/span>;<\/span>\r\n\r\n    $array_b<\/span>[<\/span>0<\/span>]<\/span> =<\/span> 1<\/span>;<\/span>\r\n\r\n    echo<\/span> \"array_a[0]:<\/span>{<\/span>$array_a<\/span>[<\/span>0<\/span>]<\/span>}<\/span> array_b[0]:<\/span>{<\/span>$array_b<\/span>[<\/span>0<\/span>]<\/span>}<\/span>\\n<\/span>\"<\/span>;<\/span>\r\n\r\n    echo<\/span> number_format<\/span>(<\/span>memory_get_usage<\/span>())<\/span> .<\/span> \"byte <\/span>\\n<\/span>\"<\/span>;<\/span>\r\n}<\/span>\r\n\r\nfunction<\/span> test3<\/span>()<\/span>\r\n{<\/span>\r\n    $sc<\/span> =<\/span> new<\/span> stdClass<\/span>();<\/span>\r\n\r\n    $sc<\/span>-><\/span>ary<\/span> =<\/span> array_fill<\/span>(<\/span>0<\/span>,<\/span> 999999<\/span>,<\/span> \"aaaa\"<\/span>);<\/span>\r\n\r\n    $sc_ref<\/span> =<\/span> $sc<\/span>;<\/span>\r\n\r\n    $sc_ref<\/span>-><\/span>ary<\/span>[<\/span>0<\/span>]<\/span> =<\/span> 1<\/span>;<\/span>\r\n\r\n    echo<\/span> \"sc->ary[0]:<\/span>{<\/span>$sc<\/span>-><\/span>ary<\/span>[<\/span>0<\/span>]<\/span>}<\/span> sc_ref->ary[0]:<\/span>{<\/span>$sc_ref<\/span>-><\/span>ary<\/span>[<\/span>0<\/span>]<\/span>}<\/span>\\n<\/span>\"<\/span>;<\/span>\r\n\r\n    echo<\/span> number_format<\/span>(<\/span>memory_get_usage<\/span>())<\/span> .<\/span> \"byte <\/span>\\n<\/span>\"<\/span>;<\/span>\r\n}<\/span>\r\n\r\n\r\necho<\/span> \"---<\/span>\\n<\/span>\"<\/span>;<\/span>\r\ntest1<\/span>();<\/span>\r\necho<\/span> \"---<\/span>\\n<\/span>\"<\/span>;<\/span>\r\ntest2<\/span>();<\/span>\r\necho<\/span> \"---<\/span>\\n<\/span>\"<\/span>;<\/span>\r\ntest3<\/span>();<\/span>\r\n<\/code><\/pre>\n
\u6267\u884c\u7ed3\u679c\u5982\u4e0b\u6240\u793a<\/p>\n
33,912,272\u5b57\u8282
\narray_a[0]: aaaa array_b[0]: 1
\n67,470,464\u5b57\u8282
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\n33,912,272\u5b57\u8282<\/p><\/blockquote>\n
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