{"id":46712,"date":"2024-12-02T11:11:22","date_gmt":"2024-12-02T03:11:22","guid":{"rendered":"https:\/\/fwq.ai\/blog\/46712\/"},"modified":"2024-12-02T11:11:22","modified_gmt":"2024-12-02T03:11:22","slug":"php%e5%87%bd%e6%95%b0%e5%a6%82%e4%bd%95%e5%a4%84%e7%90%86%e5%8f%af%e9%80%89%e5%8f%82%e6%95%b0","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/46712\/","title":{"rendered":"PHP\u51fd\u6570\u5982\u4f55\u5904\u7406\u53ef\u9009\u53c2\u6570"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>PHP\u51fd\u6570\u5982\u4f55\u5904\u7406\u53ef\u9009\u53c2\u6570<\/h1>\n<p><span style=\"color: #222222;, sans-serif;background-color: #FFFFFF\">\u5404\u4f4d\u5c0f\u4f19\u4f34\u4eec\uff0c\u5927\u5bb6\u597d\u5440\uff01\u770b\u770b\u4eca\u5929\u6211\u53c8\u7ed9\u5404\u4f4d\u5e26\u6765\u4e86\u4ec0\u4e48\u6587\u7ae0\uff1f\u672c\u6587\u6807\u9898<span style=\"color: #222222;, sans-serif;background-color: #FFFFFF\">\u662f<\/span><span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300aPHP\u51fd\u6570\u5982\u4f55\u5904\u7406\u53ef\u9009\u53c2\u6570\u300b<\/span>\uff0c\u5f88\u660e\u663e\u662f\u5173\u4e8e<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u6587\u7ae0<\/span>\u7684\u6587\u7ae0\u54c8\u54c8\u54c8\uff0c\u5176\u4e2d\u5185\u5bb9\u4e3b\u8981\u4f1a\u6d89\u53ca\u5230<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\uff0c\u5982\u679c\u80fd\u5e2e\u5230\u4f60\uff0c\u89c9\u5f97\u5f88\u4e0d\u9519\u7684\u8bdd\uff0c\u6b22\u8fce\u5404\u4f4d\u591a\u591a\u70b9\u8bc4\u548c\u5206\u4eab\uff01<\/span><\/p>\n<p>PHP \u51fd\u6570\u4e2d\u7684\u53ef\u9009\u53c2\u6570\u4f7f\u7528\u65b9\u62ec\u53f7\u58f0\u660e\uff0c\u63d0\u4f9b\u9ed8\u8ba4\u503c\uff0c\u53ef\u4ee5\u5728\u51fd\u6570\u8c03\u7528\u65f6\u7701\u7565\u3002\u4f8b\u5982\uff0c\u51fd\u6570 getUserName() \u63a5\u53d7\u4e00\u4e2a\u5fc5\u9700\u53c2\u6570 name \u548c\u4e00\u4e2a\u53ef\u9009\u53c2\u6570 optionalParam\uff0c\u5177\u6709\u9ed8\u8ba4\u503c &#8220;Anon&#8221;\u3002\u6700\u4f73\u5b9e\u8df5\u5305\u62ec\u660e\u786e\u547d\u540d\u53ef\u9009\u53c2\u6570\u3001\u4f7f\u7528\u6709\u610f\u4e49\u7684\u9ed8\u8ba4\u503c\u5e76\u8c28\u614e\u4f7f\u7528\u5b83\u4eec\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241025\/1729841323671b48ab3e3d2.jpg\" class=\"aligncenter\" title=\"PHP\u51fd\u6570\u5982\u4f55\u5904\u7406\u53ef\u9009\u53c2\u6570\u63d2\u56fe\" alt=\"PHP\u51fd\u6570\u5982\u4f55\u5904\u7406\u53ef\u9009\u53c2\u6570\u63d2\u56fe\" \/><\/p>\n<p><strong>PHP \u51fd\u6570\u5982\u4f55\u5904\u7406\u53ef\u9009\u53c2\u6570<\/strong><\/p>\n<p>PHP \u51fd\u6570\u662f\u53ef\u91cd\u590d\u4f7f\u7528\u7684\u4ee3\u7801\u5757\uff0c\u5141\u8bb8\u4f20\u9012\u53c2\u6570\u6765\u4fee\u6539\u5176\u884c\u4e3a\u3002\u53ef\u9009\u53c2\u6570\u4f7f\u60a8\u53ef\u4ee5\u63d0\u4f9b\u9ed8\u8ba4\u503c\uff0c\u5728\u51fd\u6570\u8c03\u7528\u65f6\u53ef\u4ee5\u7701\u7565\u8be5\u503c\u3002<\/p>\n<p><strong>\u8bed\u6cd5<\/strong><\/p>\n<p>\u5728\u51fd\u6570\u58f0\u660e\u4e2d\u4f7f\u7528\u65b9\u62ec\u53f7 <code>[<\/code> \u548c <code>]<\/code> \u6765\u58f0\u660e\u53ef\u9009\u53c2\u6570\uff1a<\/p>\n<pre>function myFunction($requiredParam, $optionalParam = \"\")\n{\n    \/\/ \u4ee3\u7801\n}<\/pre>\n<p><strong>\u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n<p>\u521b\u5efa\u4e00\u4e2a\u51fd\u6570\u6765\u83b7\u53d6\u7528\u6237\u540d\u79f0\uff0c\u5982\u679c\u672a\u6307\u5b9a\uff0c\u5219\u4f7f\u7528\u9ed8\u8ba4\u503c &#8220;Anon&#8221;:<\/p>\n<pre>&lt;?php\nfunction getUserName($name = \"Anon\")\n{\n    return $name;\n}\n\n$username = getUserName(); \/\/ \u4f7f\u7528\u9ed8\u8ba4\u503c\n$usernameWithParam = getUserName(\"John Doe\"); \/\/ \u4f7f\u7528\u53c2\u6570<\/pre>\n<p><strong>\u5904\u7406\u9ed8\u8ba4\u53c2\u6570<\/strong><\/p>\n<p>\u53ef\u4ee5\u4f7f\u7528\u6761\u4ef6\u8bed\u53e5\u6216 <code>isset()<\/code> \u51fd\u6570\u6765\u68c0\u67e5\u662f\u5426\u8bbe\u7f6e\u4e86\u53ef\u9009\u53c2\u6570\uff1a<\/p>\n<pre>function myFunction($requiredParam, $optionalParam = null)\n{\n    if (isset($optionalParam)) {\n        \/\/ optionalParam \u5df2\u8bbe\u7f6e\u4e3a\u975e\u7a7a\u503c\n    } else {\n        \/\/ optionalParam \u672a\u8bbe\u7f6e\u6216\u4e3a\u7a7a\n    }\n}<\/pre>\n<p><strong>\u7c7b\u578b\u63d0\u793a<\/strong><\/p>\n<p>\u53ef\u4f7f\u7528\u7c7b\u578b\u63d0\u793a\u58f0\u660e\u53ef\u9009\u53c2\u6570\u7684\u9884\u671f\u7c7b\u578b\uff1a<\/p>\n<pre>function myFunction($requiredParam, ?string $optionalParam = null)\n{\n    \/\/ optionalParam \u662f\u53ef\u7a7a\u7684 string \u7c7b\u578b\n}<\/pre>\n<p><strong>\u6700\u4f73\u5b9e\u8df5<\/strong><\/p>\n<ul>\n<li>\u660e\u786e\u5730\u547d\u540d\u53ef\u9009\u53c2\u6570\u5e76\u4f7f\u7528\u6709\u610f\u4e49\u7684\u9ed8\u8ba4\u503c\u3002<\/li>\n<li>\u5728\u6587\u6863\u4e2d\u63cf\u8ff0\u53ef\u9009\u53c2\u6570\u53ca\u5176\u9884\u671f\u7528\u9014\u3002<\/li>\n<li>\u8c28\u614e\u4f7f\u7528\u53ef\u9009\u53c2\u6570\uff0c\u56e0\u4e3a\u5b83\u4eec\u4f1a\u4f7f\u51fd\u6570\u7b7e\u540d\u66f4\u590d\u6742\u3002<\/li>\n<\/ul>\n<p>\u6587\u4e2d\u5173\u4e8ephp,\u53ef\u9009\u53c2\u6570\u7684\u77e5\u8bc6\u4ecb\u7ecd\uff0c\u5e0c\u671b\u5bf9\u4f60\u7684\u5b66\u4e60\u6709\u6240\u5e2e\u52a9\uff01\u82e5\u662f\u53d7\u76ca\u532a\u6d45\uff0c\u90a3\u5c31\u52a8\u52a8\u9f20\u6807\u6536\u85cf\u8fd9\u7bc7\u300aPHP\u51fd\u6570\u5982\u4f55\u5904\u7406\u53ef\u9009\u53c2\u6570\u300b\u6587\u7ae0\u5427\uff0c\u4e5f\u53ef\u5173\u6ce8\u7c73\u4e91\u516c\u4f17\u53f7\u4e86\u89e3\u76f8\u5173\u6280\u672f\u6587\u7ae0\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>PHP\u51fd\u6570\u5982\u4f55\u5904\u7406\u53ef\u9009\u53c2\u6570 \u5404\u4f4d\u5c0f\u4f19\u4f34\u4eec\uff0c\u5927\u5bb6\u597d\u5440\uff01\u770b\u770b\u4eca\u5929\u6211\u53c8\u7ed9\u5404\u4f4d\u5e26\u6765\u4e86\u4ec0\u4e48\u6587\u7ae0\uff1f\u672c\u6587\u6807\u9898\u662f\u300aPHP\u51fd\u6570\u5982\u4f55\u5904\u7406\u53ef\u9009\u53c2\u6570\u300b\uff0c\u5f88\u660e\u663e\u662f\u5173\u4e8e\u6587\u7ae0\u7684\u6587\u7ae0\u54c8\u54c8\u54c8\uff0c\u5176\u4e2d\u5185\u5bb9\u4e3b\u8981\u4f1a\u6d89\u53ca\u5230\u7b49\u7b49\uff0c\u5982\u679c\u80fd\u5e2e\u5230\u4f60\uff0c\u89c9\u5f97\u5f88\u4e0d\u9519\u7684\u8bdd\uff0c\u6b22\u8fce\u5404\u4f4d\u591a\u591a\u70b9\u8bc4\u548c\u5206\u4eab\uff01 PHP \u51fd\u6570\u4e2d\u7684\u53ef\u9009\u53c2\u6570\u4f7f\u7528\u65b9\u62ec\u53f7\u58f0\u660e\uff0c\u63d0\u4f9b\u9ed8\u8ba4\u503c\uff0c\u53ef\u4ee5\u5728\u51fd\u6570\u8c03\u7528\u65f6\u7701\u7565\u3002\u4f8b\u5982\uff0c\u51fd\u6570 getUserName() \u63a5\u53d7\u4e00\u4e2a\u5fc5\u9700\u53c2\u6570 name \u548c\u4e00\u4e2a\u53ef\u9009\u53c2\u6570 optionalParam\uff0c\u5177\u6709\u9ed8\u8ba4\u503c &#8220;Anon&#8221;\u3002\u6700\u4f73\u5b9e\u8df5\u5305\u62ec\u660e\u786e\u547d\u540d\u53ef\u9009\u53c2\u6570\u3001\u4f7f\u7528\u6709\u610f\u4e49\u7684\u9ed8\u8ba4\u503c\u5e76\u8c28\u614e\u4f7f\u7528\u5b83\u4eec\u3002 PHP \u51fd\u6570\u5982\u4f55\u5904\u7406\u53ef\u9009\u53c2\u6570 PHP \u51fd\u6570\u662f\u53ef\u91cd\u590d\u4f7f\u7528\u7684\u4ee3\u7801\u5757\uff0c\u5141\u8bb8\u4f20\u9012\u53c2\u6570\u6765\u4fee\u6539\u5176\u884c\u4e3a\u3002\u53ef\u9009\u53c2\u6570\u4f7f\u60a8\u53ef\u4ee5\u63d0\u4f9b\u9ed8\u8ba4\u503c\uff0c\u5728\u51fd\u6570\u8c03\u7528\u65f6\u53ef\u4ee5\u7701\u7565\u8be5\u503c\u3002 \u8bed\u6cd5 \u5728\u51fd\u6570\u58f0\u660e\u4e2d\u4f7f\u7528\u65b9\u62ec\u53f7 [ \u548c ] \u6765\u58f0\u660e\u53ef\u9009\u53c2\u6570\uff1a function myFunction($requiredParam, $optionalParam = &#8220;&#8221;) { \/\/ \u4ee3\u7801 } \u5b9e\u6218\u6848\u4f8b \u521b\u5efa\u4e00\u4e2a\u51fd\u6570\u6765\u83b7\u53d6\u7528\u6237\u540d\u79f0\uff0c\u5982\u679c\u672a\u6307\u5b9a\uff0c\u5219\u4f7f\u7528\u9ed8\u8ba4\u503c &#8220;Anon&#8221;: &lt;?php function getUserName($name = &#8220;Anon&#8221;) { return $name; } $username = getUserName(); \/\/ \u4f7f\u7528\u9ed8\u8ba4\u503c $usernameWithParam = getUserName(&#8220;John Doe&#8221;); \/\/ \u4f7f\u7528\u53c2\u6570 \u5904\u7406\u9ed8\u8ba4\u53c2\u6570 \u53ef\u4ee5\u4f7f\u7528\u6761\u4ef6\u8bed\u53e5\u6216 isset() [&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-46712","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/46712","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=46712"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/46712\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=46712"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=46712"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=46712"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}