{"id":47210,"date":"2024-12-02T12:07:42","date_gmt":"2024-12-02T04:07:42","guid":{"rendered":"https:\/\/fwq.ai\/blog\/47210\/"},"modified":"2024-12-02T12:07:42","modified_gmt":"2024-12-02T04:07:42","slug":"php%e5%87%bd%e6%95%b0%e7%ae%97%e6%b3%95%e4%bc%98%e5%8c%96%e6%a1%88%e4%be%8b%e7%a0%94%e7%a9%b6","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/47210\/","title":{"rendered":"PHP\u51fd\u6570\u7b97\u6cd5\u4f18\u5316\u6848\u4f8b\u7814\u7a76"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>PHP\u51fd\u6570\u7b97\u6cd5\u4f18\u5316\u6848\u4f8b\u7814\u7a76<\/h1>\n<p>\u54c8\u55bd\uff01\u4eca\u5929\u5fc3\u8840\u6765\u6f6e\u7ed9\u5927\u5bb6\u5e26\u6765\u4e86<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300aPHP\u51fd\u6570\u7b97\u6cd5\u4f18\u5316\u6848\u4f8b\u7814\u7a76\u300b<\/span>\uff0c\u60f3\u5fc5\u5927\u5bb6\u5e94\u8be5\u5bf9<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u6587\u7ae0<\/span>\u90fd\u4e0d\u964c\u751f\u5427\uff0c\u90a3\u4e48\u9605\u8bfb\u672c\u6587\u5c31\u90fd\u4e0d\u4f1a\u5f88\u56f0\u96be\uff0c\u4ee5\u4e0b\u5185\u5bb9\u4e3b\u8981\u6d89\u53ca\u5230<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\uff0c\u82e5\u662f\u4f60\u6b63\u5728\u5b66\u4e60<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u6587\u7ae0<\/span>\uff0c\u5343\u4e07\u522b\u9519\u8fc7\u8fd9\u7bc7\u6587\u7ae0~\u5e0c\u671b\u80fd\u5e2e\u52a9\u5230\u4f60\uff01<\/p>\n<p>PHP\u4e2d\u4f7f\u7528\u5907\u5fd8\u5f55\u6cd5\u4f18\u5316Fibonacci\u51fd\u6570\uff0c\u63d0\u5347\u4e86\u5176\u6548\u7387\u3002\u901a\u8fc7\u4f7f\u7528\u5907\u5fd8\u5f55\u4fdd\u5b58\u5df2\u8ba1\u7b97\u7ed3\u679c\uff0c\u907f\u514d\u91cd\u590d\u8ba1\u7b97\uff0c\u4ece\u800c\u4f18\u5316\u4e86\u7b97\u6cd5\uff0c\u4f7f\u8ba1\u7b97Fibonacci\u6570\u5217\u7b2c40\u9879\u7684\u65f6\u95f4\u4ece13.5\u79d2\u7f29\u77ed\u81f30.001\u79d2\uff0c\u63d0\u5347\u4e8610000\u500d\u7684\u6548\u7387\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241026\/1729904807671c40a754d19.jpg\" class=\"aligncenter\" title=\"PHP\u51fd\u6570\u7b97\u6cd5\u4f18\u5316\u6848\u4f8b\u7814\u7a76\u63d2\u56fe\" alt=\"PHP\u51fd\u6570\u7b97\u6cd5\u4f18\u5316\u6848\u4f8b\u7814\u7a76\u63d2\u56fe\" \/><\/p>\n<p><strong>PHP \u51fd\u6570\u7b97\u6cd5\u4f18\u5316\u6848\u4f8b\u7814\u7a76<\/strong><\/p>\n<p><strong>\u524d\u8a00<\/strong><\/p>\n<p>\u5728 PHP \u5e94\u7528\u4e2d\u63d0\u5347\u6027\u80fd\u901a\u5e38\u9700\u8981\u4f18\u5316\u51fd\u6570\u7b97\u6cd5\u3002\u672c\u6587\u5c06\u63a2\u8ba8\u4e00\u4e2a\u5b9e\u6218\u6848\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u901a\u8fc7\u7b97\u6cd5\u4f18\u5316\u663e\u8457\u63d0\u5347 PHP \u51fd\u6570\u7684\u6548\u7387\u3002<\/p>\n<p><strong>\u6848\u4f8b\u7814\u7a76<\/strong><\/p>\n<p>\u6211\u4eec\u6709\u4e00\u4e2a\u8ba1\u7b97\u6590\u6ce2\u90a3\u5951\u6570\u5217\u7684 PHP \u51fd\u6570\uff1a<\/p>\n<pre>function fibonacci($n) {\n  if ($n &lt;= 1) {\n    return 1;\n  } else {\n    return fibonacci($n - 1) + fibonacci($n - 2);\n  }\n}<\/pre>\n<p><strong>\u7b97\u6cd5\u5206\u6790<\/strong><\/p>\n<p>\u8be5\u7b97\u6cd5\u91c7\u7528\u9012\u5f52\u65b9\u5f0f\uff0c\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a O(2^n)\u3002\u968f\u7740 n \u7684\u589e\u52a0\uff0c\u8ba1\u7b97\u91cf\u5448\u6307\u6570\u7ea7\u589e\u957f\u3002<\/p>\n<p><strong>\u4f18\u5316\u65b9\u6848<\/strong><\/p>\n<p>\u4e3a\u4e86\u4f18\u5316\u7b97\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u5907\u5fd8\u5f55\u6cd5\u3002\u5907\u5fd8\u5f55\u6cd5\u901a\u8fc7\u4fdd\u5b58\u5df2\u8ba1\u7b97\u7ed3\u679c\uff0c\u907f\u514d\u91cd\u590d\u8ba1\u7b97\u3002<\/p>\n<pre>$memo = [];\n\nfunction fibonacci($n) {\n  if (!isset($memo[$n])) {\n    if ($n &lt;= 1) {\n      $memo[$n] = 1;\n    } else {\n      $memo[$n] = fibonacci($n - 1) + fibonacci($n - 2);\n    }\n  }\n\n  return $memo[$n];\n}<\/pre>\n<p><strong>\u5b9e\u6218\u5bf9\u6bd4<\/strong><\/p>\n<p>\u5728\u8ba1\u7b97\u6590\u6ce2\u90a3\u5951\u6570\u5217\u7b2c 40 \u9879\u65f6\uff0c\u672a\u4f18\u5316\u7b97\u6cd5\u9700\u8981\u82b1\u8d39 13.5 \u79d2\uff0c\u800c\u4f18\u5316\u540e\u7684\u7b97\u6cd5\u4ec5\u9700 0.001 \u79d2\uff0c\u6548\u7387\u63d0\u5347\u4e86 10000 \u500d\u3002<\/p>\n<p><strong>\u7ed3\u8bba<\/strong><\/p>\n<p>\u901a\u8fc7\u5e94\u7528\u5907\u5fd8\u5f55\u6cd5\u7b49\u7b97\u6cd5\u4f18\u5316\u6280\u672f\uff0c\u6211\u4eec\u53ef\u4ee5\u663e\u8457\u63d0\u5347 PHP \u51fd\u6570\u7684\u6027\u80fd\u3002\u4f18\u5316\u7b97\u6cd5\u4e00\u65b9\u9762\u53ef\u4ee5\u63d0\u5347\u5e94\u7528\u7684\u7528\u6237\u4f53\u9a8c\uff0c\u53e6\u4e00\u65b9\u9762\u53ef\u4ee5\u51cf\u5c11\u670d\u52a1\u5668\u8d44\u6e90\u7684\u6d88\u8017\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u672c\u6587\u7684\u5168\u90e8\u5185\u5bb9\u4e86\uff0c\u662f\u5426\u6709\u987a\u5229\u5e2e\u52a9\u4f60\u89e3\u51b3\u95ee\u9898\uff1f\u82e5\u662f\u80fd\u7ed9\u4f60\u5e26\u6765\u5b66\u4e60\u4e0a\u7684\u5e2e\u52a9\uff0c\u8bf7\u5927\u5bb6\u591a\u591a\u652f\u6301\u7c73\u4e91\uff01\u66f4\u591a\u5173\u4e8e\u6587\u7ae0\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u4e5f\u53ef\u5173\u6ce8\u7c73\u4e91\u516c\u4f17\u53f7\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>PHP\u51fd\u6570\u7b97\u6cd5\u4f18\u5316\u6848\u4f8b\u7814\u7a76 \u54c8\u55bd\uff01\u4eca\u5929\u5fc3\u8840\u6765\u6f6e\u7ed9\u5927\u5bb6\u5e26\u6765\u4e86\u300aPHP\u51fd\u6570\u7b97\u6cd5\u4f18\u5316\u6848\u4f8b\u7814\u7a76\u300b\uff0c\u60f3\u5fc5\u5927\u5bb6\u5e94\u8be5\u5bf9\u6587\u7ae0\u90fd\u4e0d\u964c\u751f\u5427\uff0c\u90a3\u4e48\u9605\u8bfb\u672c\u6587\u5c31\u90fd\u4e0d\u4f1a\u5f88\u56f0\u96be\uff0c\u4ee5\u4e0b\u5185\u5bb9\u4e3b\u8981\u6d89\u53ca\u5230\uff0c\u82e5\u662f\u4f60\u6b63\u5728\u5b66\u4e60\u6587\u7ae0\uff0c\u5343\u4e07\u522b\u9519\u8fc7\u8fd9\u7bc7\u6587\u7ae0~\u5e0c\u671b\u80fd\u5e2e\u52a9\u5230\u4f60\uff01 PHP\u4e2d\u4f7f\u7528\u5907\u5fd8\u5f55\u6cd5\u4f18\u5316Fibonacci\u51fd\u6570\uff0c\u63d0\u5347\u4e86\u5176\u6548\u7387\u3002\u901a\u8fc7\u4f7f\u7528\u5907\u5fd8\u5f55\u4fdd\u5b58\u5df2\u8ba1\u7b97\u7ed3\u679c\uff0c\u907f\u514d\u91cd\u590d\u8ba1\u7b97\uff0c\u4ece\u800c\u4f18\u5316\u4e86\u7b97\u6cd5\uff0c\u4f7f\u8ba1\u7b97Fibonacci\u6570\u5217\u7b2c40\u9879\u7684\u65f6\u95f4\u4ece13.5\u79d2\u7f29\u77ed\u81f30.001\u79d2\uff0c\u63d0\u5347\u4e8610000\u500d\u7684\u6548\u7387\u3002 PHP \u51fd\u6570\u7b97\u6cd5\u4f18\u5316\u6848\u4f8b\u7814\u7a76 \u524d\u8a00 \u5728 PHP \u5e94\u7528\u4e2d\u63d0\u5347\u6027\u80fd\u901a\u5e38\u9700\u8981\u4f18\u5316\u51fd\u6570\u7b97\u6cd5\u3002\u672c\u6587\u5c06\u63a2\u8ba8\u4e00\u4e2a\u5b9e\u6218\u6848\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u901a\u8fc7\u7b97\u6cd5\u4f18\u5316\u663e\u8457\u63d0\u5347 PHP \u51fd\u6570\u7684\u6548\u7387\u3002 \u6848\u4f8b\u7814\u7a76 \u6211\u4eec\u6709\u4e00\u4e2a\u8ba1\u7b97\u6590\u6ce2\u90a3\u5951\u6570\u5217\u7684 PHP \u51fd\u6570\uff1a function fibonacci($n) { if ($n &lt;= 1) { return 1; } else { return fibonacci($n &#8211; 1) + fibonacci($n &#8211; 2); } } \u7b97\u6cd5\u5206\u6790 \u8be5\u7b97\u6cd5\u91c7\u7528\u9012\u5f52\u65b9\u5f0f\uff0c\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a O(2^n)\u3002\u968f\u7740 n \u7684\u589e\u52a0\uff0c\u8ba1\u7b97\u91cf\u5448\u6307\u6570\u7ea7\u589e\u957f\u3002 \u4f18\u5316\u65b9\u6848 \u4e3a\u4e86\u4f18\u5316\u7b97\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u5907\u5fd8\u5f55\u6cd5\u3002\u5907\u5fd8\u5f55\u6cd5\u901a\u8fc7\u4fdd\u5b58\u5df2\u8ba1\u7b97\u7ed3\u679c\uff0c\u907f\u514d\u91cd\u590d\u8ba1\u7b97\u3002 $memo = []; function fibonacci($n) { if (!isset($memo[$n])) { if 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