{"id":48486,"date":"2024-12-02T09:05:33","date_gmt":"2024-12-02T01:05:33","guid":{"rendered":"https:\/\/fwq.ai\/blog\/48486\/"},"modified":"2024-12-02T09:05:33","modified_gmt":"2024-12-02T01:05:33","slug":"php-%e5%87%bd%e6%95%b0%e7%9a%84%e5%87%bd%e6%95%b0%e6%8c%87%e9%92%88%e5%a6%82%e4%bd%95%e8%bf%9b%e8%a1%8c%e7%b1%bb%e5%9e%8b%e6%a3%80%e6%9f%a5%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/48486\/","title":{"rendered":"PHP \u51fd\u6570\u7684\u51fd\u6570\u6307\u9488\u5982\u4f55\u8fdb\u884c\u7c7b\u578b\u68c0\u67e5\uff1f"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>PHP \u51fd\u6570\u7684\u51fd\u6570\u6307\u9488\u5982\u4f55\u8fdb\u884c\u7c7b\u578b\u68c0\u67e5\uff1f<\/h1>\n<p>\u6b22\u8fce\u5404\u4f4d\u5c0f\u4f19\u4f34\u6765\u5230\u7c73\u4e91\uff0c\u76f8\u805a\u4e8e\u6b64\u90fd\u662f\u7f18\u54c8\u54c8\u54c8\uff01\u4eca\u5929\u6211\u7ed9\u5927\u5bb6\u5e26\u6765<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300aPHP \u51fd\u6570\u7684\u51fd\u6570\u6307\u9488\u5982\u4f55\u8fdb\u884c\u7c7b\u578b\u68c0\u67e5\uff1f\u300b<\/span>\uff0c\u8fd9\u7bc7\u6587\u7ae0\u4e3b\u8981\u8bb2\u5230<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\u77e5\u8bc6\uff0c\u5982\u679c\u4f60\u5bf9<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u6587\u7ae0<\/span>\u76f8\u5173\u7684\u77e5\u8bc6\u975e\u5e38\u611f\u5174\u8da3\u6216\u8005\u6b63\u5728\u81ea\u5b66\uff0c\u90fd\u53ef\u4ee5\u5173\u6ce8\u6211\uff0c\u6211\u4f1a\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u6587\u7ae0\uff01\u5f53\u7136\uff0c\u6709\u4ec0\u4e48\u5efa\u8bae\u4e5f\u6b22\u8fce\u5728\u8bc4\u8bba\u7559\u8a00\u63d0\u51fa\uff01\u4e00\u8d77\u5b66\u4e60\uff01<\/p>\n<p>PHP \u4e2d\u51fd\u6570\u6307\u9488\u7684\u7c7b\u578b\u68c0\u67e5\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u8fdb\u884c\uff1a\u4f7f\u7528 is_callable() \u51fd\u6570\u68c0\u67e5\u51fd\u6570\u6307\u9488\u662f\u5426\u6709\u6548\u4f7f\u7528\u7c7b\u578b\u522b\u540d\u6307\u5b9a\u51fd\u6570\u6307\u9488\u7684\u7c7b\u578b\u4ee5\u8fdb\u884c\u9759\u6001\u7c7b\u578b\u68c0\u67e5<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241027\/1730035901671e40bd5efe1.jpg\" class=\"aligncenter\" title=\"PHP \u51fd\u6570\u7684\u51fd\u6570\u6307\u9488\u5982\u4f55\u8fdb\u884c\u7c7b\u578b\u68c0\u67e5\uff1f\u63d2\u56fe\" alt=\"PHP \u51fd\u6570\u7684\u51fd\u6570\u6307\u9488\u5982\u4f55\u8fdb\u884c\u7c7b\u578b\u68c0\u67e5\uff1f\u63d2\u56fe\" \/><\/p>\n<p><strong>PHP \u51fd\u6570\u7684\u51fd\u6570\u6307\u9488\u7c7b\u578b\u68c0\u67e5<\/strong><\/p>\n<p>\u51fd\u6570\u6307\u9488\u662f\u4e00\u79cd\u6307\u5411\u51fd\u6570\u5185\u5b58\u5730\u5740\u7684\u6570\u636e\u7c7b\u578b\u3002\u5728 PHP \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>fn<\/code> \u5173\u952e\u5b57\u6216\u533f\u540d\u51fd\u6570\u6765\u521b\u5efa\u51fd\u6570\u6307\u9488\u3002<\/p>\n<p><strong>\u7c7b\u578b\u68c0\u67e5<\/strong><\/p>\n<p>PHP \u81ea\u8eab\u4e0d\u5f3a\u5236\u8fdb\u884c\u7c7b\u578b\u68c0\u67e5\uff0c\u4f46\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u6280\u5de7\u6765\u68c0\u67e5\u51fd\u6570\u6307\u9488\u7c7b\u578b\uff1a<\/p>\n<p><strong>1. <code>is_callable()<\/code> \u51fd\u6570\uff1a<\/strong><\/p>\n<pre>is_callable($functionPointer); \/\/ \u8fd4\u56de true \u5982\u679c $functionPointer \u662f\u51fd\u6570\u6307\u9488<\/pre>\n<p><strong>2. \u7c7b\u578b\u522b\u540d\uff1a<\/strong><\/p>\n<pre>type FunctionPointer = callable;\n\nfunction isValidFunctionPointer(FunctionPointer $functionPointer): bool {\n    return is_callable($functionPointer);\n}<\/pre>\n<p><strong>\u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n<p>\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a <code>greet()<\/code> \u51fd\u6570\uff1a<\/p>\n<pre>function greet(string $name): string {\n    return \"Hello, $name!\";\n}<\/pre>\n<p>\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u533f\u540d\u51fd\u6570\u521b\u5efa\u5b83\u7684\u51fd\u6570\u6307\u9488\uff1a<\/p>\n<pre>$greetFunctionPointer = fn(string $name) =&gt; greet($name);<\/pre>\n<p>\u73b0\u5728\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u7c7b\u578b\u68c0\u67e5\u6765\u9a8c\u8bc1\u51fd\u6570\u6307\u9488\uff1a<\/p>\n<pre>if (is_callable($greetFunctionPointer)) {\n    \/\/ $greetFunctionPointer \u662f\u6709\u6548\u7684\u51fd\u6570\u6307\u9488\n} else {\n    \/\/ $greetFunctionPointer \u4e0d\u662f\u6709\u6548\u7684\u51fd\u6570\u6307\u9488\n}<\/pre>\n<p><strong>\u6ce8\u610f\u4e8b\u9879<\/strong><\/p>\n<ul>\n<li>\u786e\u4fdd\u51fd\u6570\u6307\u9488\u6307\u5411\u6b63\u786e\u7684\u51fd\u6570\uff0c\u5426\u5219\u53ef\u80fd\u4f1a\u5bfc\u81f4\u610f\u5916\u884c\u4e3a\u3002<\/li>\n<li>\u5728\u4e25\u683c\u6a21\u5f0f\u4e0b\uff0cPHP \u4f1a\u5c06\u7c7b\u578b\u9519\u8bef\u8f6c\u6362\u4e3a\u81f4\u547d\u9519\u8bef\uff0c\u56e0\u6b64\u9a8c\u8bc1\u51fd\u6570\u6307\u9488\u975e\u5e38\u91cd\u8981\u3002<\/li>\n<li>\u5c3d\u7ba1 PHP \u4e0d\u5f3a\u5236\u8fdb\u884c\u7c7b\u578b\u68c0\u67e5\uff0c\u4f46\u4f7f\u7528\u7c7b\u578b\u68c0\u67e5\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u7801\u53ef\u7ef4\u62a4\u6027\u548c\u5b89\u5168\u6027\u3002<\/li>\n<\/ul>\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\u7684\u51fd\u6570\u6307\u9488\u5982\u4f55\u8fdb\u884c\u7c7b\u578b\u68c0\u67e5\uff1f \u6b22\u8fce\u5404\u4f4d\u5c0f\u4f19\u4f34\u6765\u5230\u7c73\u4e91\uff0c\u76f8\u805a\u4e8e\u6b64\u90fd\u662f\u7f18\u54c8\u54c8\u54c8\uff01\u4eca\u5929\u6211\u7ed9\u5927\u5bb6\u5e26\u6765\u300aPHP \u51fd\u6570\u7684\u51fd\u6570\u6307\u9488\u5982\u4f55\u8fdb\u884c\u7c7b\u578b\u68c0\u67e5\uff1f\u300b\uff0c\u8fd9\u7bc7\u6587\u7ae0\u4e3b\u8981\u8bb2\u5230\u7b49\u7b49\u77e5\u8bc6\uff0c\u5982\u679c\u4f60\u5bf9\u6587\u7ae0\u76f8\u5173\u7684\u77e5\u8bc6\u975e\u5e38\u611f\u5174\u8da3\u6216\u8005\u6b63\u5728\u81ea\u5b66\uff0c\u90fd\u53ef\u4ee5\u5173\u6ce8\u6211\uff0c\u6211\u4f1a\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u6587\u7ae0\uff01\u5f53\u7136\uff0c\u6709\u4ec0\u4e48\u5efa\u8bae\u4e5f\u6b22\u8fce\u5728\u8bc4\u8bba\u7559\u8a00\u63d0\u51fa\uff01\u4e00\u8d77\u5b66\u4e60\uff01 PHP \u4e2d\u51fd\u6570\u6307\u9488\u7684\u7c7b\u578b\u68c0\u67e5\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u8fdb\u884c\uff1a\u4f7f\u7528 is_callable() \u51fd\u6570\u68c0\u67e5\u51fd\u6570\u6307\u9488\u662f\u5426\u6709\u6548\u4f7f\u7528\u7c7b\u578b\u522b\u540d\u6307\u5b9a\u51fd\u6570\u6307\u9488\u7684\u7c7b\u578b\u4ee5\u8fdb\u884c\u9759\u6001\u7c7b\u578b\u68c0\u67e5 PHP \u51fd\u6570\u7684\u51fd\u6570\u6307\u9488\u7c7b\u578b\u68c0\u67e5 \u51fd\u6570\u6307\u9488\u662f\u4e00\u79cd\u6307\u5411\u51fd\u6570\u5185\u5b58\u5730\u5740\u7684\u6570\u636e\u7c7b\u578b\u3002\u5728 PHP \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 fn \u5173\u952e\u5b57\u6216\u533f\u540d\u51fd\u6570\u6765\u521b\u5efa\u51fd\u6570\u6307\u9488\u3002 \u7c7b\u578b\u68c0\u67e5 PHP \u81ea\u8eab\u4e0d\u5f3a\u5236\u8fdb\u884c\u7c7b\u578b\u68c0\u67e5\uff0c\u4f46\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u6280\u5de7\u6765\u68c0\u67e5\u51fd\u6570\u6307\u9488\u7c7b\u578b\uff1a 1. is_callable() \u51fd\u6570\uff1a is_callable($functionPointer); \/\/ \u8fd4\u56de true \u5982\u679c $functionPointer \u662f\u51fd\u6570\u6307\u9488 2. \u7c7b\u578b\u522b\u540d\uff1a type FunctionPointer = callable; function isValidFunctionPointer(FunctionPointer $functionPointer): bool { return is_callable($functionPointer); } \u5b9e\u6218\u6848\u4f8b \u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a greet() \u51fd\u6570\uff1a function greet(string $name): string { return &#8220;Hello, $name!&#8221;; } [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-48486","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/48486","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=48486"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/48486\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=48486"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=48486"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=48486"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}