{"id":48518,"date":"2024-12-02T12:03:16","date_gmt":"2024-12-02T04:03:16","guid":{"rendered":"https:\/\/fwq.ai\/blog\/48518\/"},"modified":"2024-12-02T12:03:16","modified_gmt":"2024-12-02T04:03:16","slug":"%e5%a6%82%e4%bd%95%e9%92%88%e5%af%b9%e4%b8%8d%e5%90%8c%e7%9a%84-php-%e7%89%88%e6%9c%ac%e4%bc%98%e5%8c%96%e9%80%92%e5%bd%92%e5%87%bd%e6%95%b0%e7%9a%84%e5%a0%86%e6%a0%88%e4%bd%bf%e7%94%a8","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/48518\/","title":{"rendered":"\u5982\u4f55\u9488\u5bf9\u4e0d\u540c\u7684 PHP \u7248\u672c\u4f18\u5316\u9012\u5f52\u51fd\u6570\u7684\u5806\u6808\u4f7f\u7528"},"content":{"rendered":"

<\/b> <\/p>\n

\u5982\u4f55\u9488\u5bf9\u4e0d\u540c\u7684 PHP \u7248\u672c\u4f18\u5316\u9012\u5f52\u51fd\u6570\u7684\u5806\u6808\u4f7f\u7528<\/h1>\n

\u6765\u5230\u7c73\u4e91\u7684\u5927\u5bb6\uff0c\u76f8\u4fe1\u90fd\u662f\u7f16\u7a0b\u5b66\u4e60\u7231\u597d\u8005\uff0c\u5e0c\u671b\u5728\u8fd9\u91cc\u5b66\u4e60\u6587\u7ae0\u76f8\u5173\u7f16\u7a0b\u77e5\u8bc6\u3002\u4e0b\u9762\u672c\u7bc7\u6587\u7ae0\u5c31\u6765\u5e26\u5927\u5bb6\u804a\u804a\u300a\u5982\u4f55\u9488\u5bf9\u4e0d\u540c\u7684 PHP \u7248\u672c\u4f18\u5316\u9012\u5f52\u51fd\u6570\u7684\u5806\u6808\u4f7f\u7528\u300b\uff0c\u4ecb\u7ecd\u4e00\u4e0b\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u7684\u77e5\u8bc6\u79ef\u7d2f\u6709\u6240\u5e2e\u52a9\uff0c\u52a9\u529b\u5b9e\u6218\u5f00\u53d1\uff01<\/p>\n

\"\u5982\u4f55\u9488\u5bf9\u4e0d\u540c\u7684<\/p>\n

\u5982\u4f55\u9488\u5bf9\u4e0d\u540c\u7684 PHP \u7248\u672c\u4f18\u5316\u9012\u5f52\u51fd\u6570\u7684\u5806\u6808\u4f7f\u7528<\/strong><\/p>\n

\u524d\u8a00<\/strong><\/p>\n

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PHP 5.6 \u53ca\u66f4\u4f4e\u7248\u672c<\/strong><\/p>\n

\u5728 PHP 5.6 \u53ca\u66f4\u4f4e\u7248\u672c\u4e2d\uff0c\u9012\u5f52\u8c03\u7528\u4f1a\u521b\u5efa\u65b0\u7684\u5806\u6808\u5e27\uff0c\u4ece\u800c\u589e\u52a0\u5806\u6808\u4f7f\u7528\u91cf\u3002\u4e3a\u4e86\u4f18\u5316\u8fd9\u79cd\u60c5\u51b5\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u6280\u672f\uff1a<\/p>\n

\/\/ \u81ea\u5b9a\u4e49\u5806\u6808\u7ba1\u7406\u51fd\u6570\nfunction stack_deep($stack = [], $limit = 5000) {\n    if (count($stack) >= $limit) {\n        throw new RuntimeException('Recursion limit exceeded');\n    }\n    $stack[] = debug_backtrace();\n    return $stack;\n}\n\n\/\/ \u5728\u51fd\u6570\u8c03\u7528\u4e2d\u4f7f\u7528\u81ea\u5b9a\u4e49\u5806\u6808\u7ba1\u7406\nfunction factorial($n, $stack = []) {\n    $stack = stack_deep($stack);\n    if ($n <= 1) {\n        return 1;\n    }\n    return $n * factorial($n - 1, $stack);\n}<\/pre>\n
PHP 7.0 \u53ca\u66f4\u9ad8\u7248\u672c<\/strong><\/p>\n
\u4ece PHP 7.0 \u5f00\u59cb\uff0c\u5f15\u5165\u4e86\u4f18\u5316\u9012\u5f52\u8c03\u7528\u7684\u5c3e\u9012\u5f52\u4f18\u5316 (TCO)\u3002TCO \u5141\u8bb8\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u5c06\u9012\u5f52\u8c03\u7528\u8f6c\u6362\u4e3a\u8fed\u4ee3\uff0c\u4ece\u800c\u51cf\u5c11\u5806\u6808\u4f7f\u7528\u3002\u4e3a\u4e86\u5229\u7528 TCO\uff0c\u9700\u8981\u786e\u4fdd\u9012\u5f52\u51fd\u6570\u7684\u6700\u540e\u4e00\u4e2a\u8c03\u7528\u662f\u9012\u5f52\u8c03\u7528\u3002<\/p>\n
\/\/ \u5229\u7528 TCO \u4f18\u5316\u5c3e\u9012\u5f52\nfunction factorialTCO($n, $mul = 1) {\n    if ($n <= 1) {\n        return $mul;\n    }\n    return factorialTCO($n - 1, $mul * $n);\n}<\/pre>\n
\u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n
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\/\/ \u8ba1\u7b97\u9636\u4e58\u7684\u672a\u4f18\u5316\u9012\u5f52\u51fd\u6570\nfunction factorialNaive($n) {\n    if ($n <= 1) {\n        return 1;\n    }\n    return $n * factorialNaive($n - 1);\n}<\/pre>\n
\u8fd9\u4e2a\u672a\u4f18\u5316\u7684\u7248\u672c\u5728\u5904\u7406\u5927\u578b\u6570\u5b57\u65f6\u53ef\u80fd\u4f1a\u5bfc\u81f4\u5806\u6808\u6ea2\u51fa\u3002<\/p>\n
\u4f18\u5316\u6848\u4f8b<\/strong><\/p>\n
\u6211\u4eec\u53ef\u4ee5\u9488\u5bf9\u4e0d\u540c\u7248\u672c\u7684 PHP \u4f18\u5316\u6b64\u51fd\u6570\u3002\u5bf9\u4e8e PHP 5.6 \u53ca\u66f4\u4f4e\u7248\u672c\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u81ea\u5b9a\u4e49\u5806\u6808\u7ba1\u7406\uff1a<\/p>\n
\/\/ \u81ea\u5b9a\u4e49\u5806\u6808\u7ba1\u7406\u4f18\u5316\nfunction factorialOptimized56($n) {\n    $stack = [];\n    return factorial($n, $stack);\n}<\/pre>\n
\u800c\u5bf9\u4e8e PHP 7.0 \u53ca\u66f4\u9ad8\u7248\u672c\uff0c\u6211\u4eec\u53ef\u4ee5\u5229\u7528 TCO\uff1a<\/p>\n
\/\/ TCO \u4f18\u5316\nfunction factorialOptimized70($n) {\n    return factorialTCO($n);\n}<\/pre>\n
\u7ed3\u8bba<\/strong><\/p>\n
\u901a\u8fc7\u9488\u5bf9\u4e0d\u540c\u7248\u672c\u7684 PHP \u4f18\u5316\u9012\u5f52\u51fd\u6570\uff0c\u6211\u4eec\u53ef\u4ee5\u907f\u514d\u5806\u6808\u6ea2\u51fa\u9519\u8bef\u5e76\u63d0\u9ad8\u5e94\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\u3002\u5bf9\u4e8e PHP 7.0 \u53ca\u66f4\u9ad8\u7248\u672c\uff0c\u5229\u7528 TCO \u53ef\u4ee5\u663e\u8457\u51cf\u5c11\u5806\u6808\u4f7f\u7528\u3002<\/p>\n
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