{"id":48262,"date":"2024-12-02T16:21:33","date_gmt":"2024-12-02T08:21:33","guid":{"rendered":"https:\/\/fwq.ai\/blog\/48262\/"},"modified":"2024-12-02T16:21:33","modified_gmt":"2024-12-02T08:21:33","slug":"php%e5%87%bd%e6%95%b0%e5%a6%82%e4%bd%95%e5%a4%84%e7%90%86%e7%bc%ba%e5%a4%b1%e5%8f%82%e6%95%b0","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/48262\/","title":{"rendered":"PHP\u51fd\u6570\u5982\u4f55\u5904\u7406\u7f3a\u5931\u53c2\u6570"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>PHP\u51fd\u6570\u5982\u4f55\u5904\u7406\u7f3a\u5931\u53c2\u6570<\/h1>\n<p>\u4f60\u5728\u5b66\u4e60<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u6587\u7ae0<\/span>\u76f8\u5173\u7684\u77e5\u8bc6\u5417\uff1f\u672c\u6587<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300aPHP\u51fd\u6570\u5982\u4f55\u5904\u7406\u7f3a\u5931\u53c2\u6570\u300b<\/span>\uff0c\u4e3b\u8981\u4ecb\u7ecd\u7684\u5185\u5bb9\u5c31\u6d89\u53ca\u5230<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\uff0c\u5982\u679c\u4f60\u60f3\u63d0\u5347\u81ea\u5df1\u7684\u5f00\u53d1\u80fd\u529b\uff0c\u5c31\u4e0d\u8981\u9519\u8fc7\u8fd9\u7bc7\u6587\u7ae0\uff0c\u5927\u5bb6\u8981\u77e5\u9053\u7f16\u7a0b\u7406\u8bba\u57fa\u7840\u548c\u5b9e\u6218\u64cd\u4f5c\u90fd\u662f\u4e0d\u53ef\u6216\u7f3a\u7684\u54e6\uff01<\/p>\n<p>PHP \u63d0\u4f9b\u591a\u79cd\u673a\u5236\u5904\u7406\u7f3a\u5931\u53c2\u6570\uff0c\u5305\u62ec\uff1a\u9ed8\u8ba4\u53c2\u6570\uff1a\u5728\u5b9a\u4e49\u51fd\u6570\u65f6\u6307\u5b9a\u9ed8\u8ba4\u503c\u3002isset() \u51fd\u6570\uff1a\u68c0\u67e5\u53d8\u91cf\u662f\u5426\u5df2\u8bbe\u7f6e\u3002\u5b9e\u6218\u6848\u4f8b\uff1a\u4f7f\u7528 isset() \u51fd\u6570\u68c0\u67e5\u8868\u5355\u6570\u636e\u7684\u53ef\u9009\u53c2\u6570\u3002\u53ef\u9009\u53c2\u6570\uff08PHP 8\uff09\uff1a\u5141\u8bb8\u5b9a\u4e49\u53ef\u9009\u53c2\u6570\uff0c\u6ca1\u6709\u9ed8\u8ba4\u503c\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241027\/1730005538671dca22b3770.jpg\" class=\"aligncenter\" title=\"PHP\u51fd\u6570\u5982\u4f55\u5904\u7406\u7f3a\u5931\u53c2\u6570\u63d2\u56fe\" alt=\"PHP\u51fd\u6570\u5982\u4f55\u5904\u7406\u7f3a\u5931\u53c2\u6570\u63d2\u56fe\" \/><\/p>\n<p><strong>PHP \u51fd\u6570\u5904\u7406\u7f3a\u5931\u53c2\u6570<\/strong><\/p>\n<p><strong>\u7b80\u4ecb<\/strong><\/p>\n<p>PHP \u51fd\u6570\u53ef\u4ee5\u63a5\u6536\u53c2\u6570\uff0c\u8fd9\u4e9b\u53c2\u6570\u6709\u52a9\u4e8e\u63a7\u5236\u51fd\u6570\u7684\u884c\u4e3a\u3002\u7136\u800c\uff0c\u6709\u65f6\u8c03\u7528\u51fd\u6570\u65f6\uff0c\u4f60\u53ef\u80fd\u60f3\u8981\u4fdd\u7559\u67d0\u4e9b\u53c2\u6570\u7684\u9ed8\u8ba4\u884c\u4e3a\u3002PHP \u63d0\u4f9b\u4e86\u591a\u79cd\u673a\u5236\u6765\u5904\u7406\u7f3a\u5931\u7684\u53c2\u6570\u3002<\/p>\n<p><strong>\u9ed8\u8ba4\u53c2\u6570<\/strong><\/p>\n<p>\u9ed8\u8ba4\u53c2\u6570\u5141\u8bb8\u4f60\u5728\u5b9a\u4e49\u51fd\u6570\u65f6\u6307\u5b9a\u4e00\u4e2a\u9ed8\u8ba4\u503c\u3002\u5982\u679c\u51fd\u6570\u8c03\u7528\u4e0d\u63d0\u4f9b\u8be5\u53c2\u6570\uff0c\u5219\u5c06\u4f7f\u7528\u9ed8\u8ba4\u503c\u3002\u4f8b\u5982\uff1a<\/p>\n<pre>function greet($name = \"World\") {\n  echo \"Hello, $name!\";\n}<\/pre>\n<p>\u8c03\u7528 <code>greet()<\/code> \u51fd\u6570\u65f6\uff0c\u5982\u679c\u4e0d\u4f20\u9012\u53c2\u6570\uff0c\u9ed8\u8ba4\u503c\u4e3a &#8220;World&#8221; \u5c06\u88ab\u4f7f\u7528\u3002<\/p>\n<p><strong>isset() \u51fd\u6570<\/strong><\/p>\n<p><code>isset()<\/code> \u51fd\u6570\u7528\u4e8e\u68c0\u67e5\u53d8\u91cf\u662f\u5426\u5df2\u8bbe\u7f6e\u3002\u4f60\u53ef\u4ee5\u4f7f\u7528\u5b83\u6765\u68c0\u67e5\u51fd\u6570\u8c03\u7528\u4e2d\u662f\u5426\u63d0\u4f9b\u4e86\u7279\u5b9a\u53c2\u6570\u3002\u4f8b\u5982\uff1a<\/p>\n<pre>function sum($num1, $num2) {\n  if (isset($num2)) {\n    return $num1 + $num2;\n  } else {\n    return $num1;\n  }\n}<\/pre>\n<p><strong>\u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n<p>\u5047\u8bbe\u4f60\u6709\u4e00\u4e2a\u6ce8\u518c\u8868\u5355\uff0c\u9700\u8981\u6536\u96c6\u7528\u6237\u7684\u59d3\u540d\u3001\u7535\u5b50\u90ae\u4ef6\u548c\u7535\u8bdd\u53f7\u7801\u3002\u4f60\u53ef\u4ee5\u4f7f\u7528 <code>$_POST<\/code> \u6570\u7ec4\u83b7\u53d6\u8868\u5355\u6570\u636e\uff0c\u5e76\u4f7f\u7528 <code>isset()<\/code>: \u51fd\u6570\u68c0\u67e5\u53c2\u6570\u662f\u5426\u5b58\u5728\u3002<\/p>\n<pre>$name = isset($_POST['name']) ? $_POST['name'] : '';\n$email = isset($_POST['email']) ? $_POST['email'] : '';\n$phone = isset($_POST['phone']) ? $_POST['phone'] : '';\n\n\/\/ \u9a8c\u8bc1\u6570\u636e\u5e76\u4fdd\u5b58\u7528\u6237<\/pre>\n<p><strong>\u53ef\u9009\u53c2\u6570<\/strong><\/p>\n<p>PHP 8 \u5f15\u5165\u4e86\u53ef\u9009\u53c2\u6570\uff0c\u5b83\u5141\u8bb8\u4f60\u6ca1\u6709\u4efb\u4f55\u9ed8\u8ba4\u503c\u5730\u5b9a\u4e49\u53ef\u9009\u53c2\u6570\u3002\u53ef\u9009\u53c2\u6570\u5fc5\u987b\u653e\u5728\u53c2\u6570\u5217\u8868\u7684\u672b\u5c3e\u3002\u4f8b\u5982\uff1a<\/p>\n<pre>function greet($name, $greeting = null) {\n  $greeting = $greeting ?: \"Hello\";\n  echo \"$greeting, $name!\";\n}<\/pre>\n<p>\u5982\u679c <code>$greeting<\/code> \u53c2\u6570\u4e0d\u4f20\u9012\uff0c\u5b83\u5c06\u88ab\u8bbe\u7f6e\u4e3a <code>null<\/code>\uff0c\u5e76\u5728 ?: \u64cd\u4f5c\u7b26\u4e2d\u5206\u914d\u56de\u9ed8\u8ba4\u503c &#8220;Hello&#8221;\u3002<\/p>\n<p><strong>\u7ed3\u8bba<\/strong><\/p>\n<p>\u901a\u8fc7\u8fd9\u4e9b\u673a\u5236\uff0c\u4f60\u53ef\u4ee5\u4f18\u96c5\u5730\u5904\u7406 PHP \u51fd\u6570\u4e2d\u7684\u7f3a\u5931\u53c2\u6570\u3002\u8fd9\u4f7f\u4f60\u80fd\u591f\u521b\u5efa\u7075\u6d3b\u4e14\u9c81\u68d2\u7684\u4ee3\u7801\uff0c\u5e76\u907f\u514d\u5728\u5904\u7406\u53c2\u6570\u65f6\u51fa\u73b0\u9519\u8bef\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\u5982\u4f55\u5904\u7406\u7f3a\u5931\u53c2\u6570 \u4f60\u5728\u5b66\u4e60\u6587\u7ae0\u76f8\u5173\u7684\u77e5\u8bc6\u5417\uff1f\u672c\u6587\u300aPHP\u51fd\u6570\u5982\u4f55\u5904\u7406\u7f3a\u5931\u53c2\u6570\u300b\uff0c\u4e3b\u8981\u4ecb\u7ecd\u7684\u5185\u5bb9\u5c31\u6d89\u53ca\u5230\uff0c\u5982\u679c\u4f60\u60f3\u63d0\u5347\u81ea\u5df1\u7684\u5f00\u53d1\u80fd\u529b\uff0c\u5c31\u4e0d\u8981\u9519\u8fc7\u8fd9\u7bc7\u6587\u7ae0\uff0c\u5927\u5bb6\u8981\u77e5\u9053\u7f16\u7a0b\u7406\u8bba\u57fa\u7840\u548c\u5b9e\u6218\u64cd\u4f5c\u90fd\u662f\u4e0d\u53ef\u6216\u7f3a\u7684\u54e6\uff01 PHP \u63d0\u4f9b\u591a\u79cd\u673a\u5236\u5904\u7406\u7f3a\u5931\u53c2\u6570\uff0c\u5305\u62ec\uff1a\u9ed8\u8ba4\u53c2\u6570\uff1a\u5728\u5b9a\u4e49\u51fd\u6570\u65f6\u6307\u5b9a\u9ed8\u8ba4\u503c\u3002isset() \u51fd\u6570\uff1a\u68c0\u67e5\u53d8\u91cf\u662f\u5426\u5df2\u8bbe\u7f6e\u3002\u5b9e\u6218\u6848\u4f8b\uff1a\u4f7f\u7528 isset() \u51fd\u6570\u68c0\u67e5\u8868\u5355\u6570\u636e\u7684\u53ef\u9009\u53c2\u6570\u3002\u53ef\u9009\u53c2\u6570\uff08PHP 8\uff09\uff1a\u5141\u8bb8\u5b9a\u4e49\u53ef\u9009\u53c2\u6570\uff0c\u6ca1\u6709\u9ed8\u8ba4\u503c\u3002 PHP \u51fd\u6570\u5904\u7406\u7f3a\u5931\u53c2\u6570 \u7b80\u4ecb PHP \u51fd\u6570\u53ef\u4ee5\u63a5\u6536\u53c2\u6570\uff0c\u8fd9\u4e9b\u53c2\u6570\u6709\u52a9\u4e8e\u63a7\u5236\u51fd\u6570\u7684\u884c\u4e3a\u3002\u7136\u800c\uff0c\u6709\u65f6\u8c03\u7528\u51fd\u6570\u65f6\uff0c\u4f60\u53ef\u80fd\u60f3\u8981\u4fdd\u7559\u67d0\u4e9b\u53c2\u6570\u7684\u9ed8\u8ba4\u884c\u4e3a\u3002PHP \u63d0\u4f9b\u4e86\u591a\u79cd\u673a\u5236\u6765\u5904\u7406\u7f3a\u5931\u7684\u53c2\u6570\u3002 \u9ed8\u8ba4\u53c2\u6570 \u9ed8\u8ba4\u53c2\u6570\u5141\u8bb8\u4f60\u5728\u5b9a\u4e49\u51fd\u6570\u65f6\u6307\u5b9a\u4e00\u4e2a\u9ed8\u8ba4\u503c\u3002\u5982\u679c\u51fd\u6570\u8c03\u7528\u4e0d\u63d0\u4f9b\u8be5\u53c2\u6570\uff0c\u5219\u5c06\u4f7f\u7528\u9ed8\u8ba4\u503c\u3002\u4f8b\u5982\uff1a function greet($name = &#8220;World&#8221;) { echo &#8220;Hello, $name!&#8221;; } \u8c03\u7528 greet() \u51fd\u6570\u65f6\uff0c\u5982\u679c\u4e0d\u4f20\u9012\u53c2\u6570\uff0c\u9ed8\u8ba4\u503c\u4e3a &#8220;World&#8221; \u5c06\u88ab\u4f7f\u7528\u3002 isset() \u51fd\u6570 isset() \u51fd\u6570\u7528\u4e8e\u68c0\u67e5\u53d8\u91cf\u662f\u5426\u5df2\u8bbe\u7f6e\u3002\u4f60\u53ef\u4ee5\u4f7f\u7528\u5b83\u6765\u68c0\u67e5\u51fd\u6570\u8c03\u7528\u4e2d\u662f\u5426\u63d0\u4f9b\u4e86\u7279\u5b9a\u53c2\u6570\u3002\u4f8b\u5982\uff1a function sum($num1, $num2) { if (isset($num2)) { return $num1 + $num2; } else { return $num1; } } \u5b9e\u6218\u6848\u4f8b \u5047\u8bbe\u4f60\u6709\u4e00\u4e2a\u6ce8\u518c\u8868\u5355\uff0c\u9700\u8981\u6536\u96c6\u7528\u6237\u7684\u59d3\u540d\u3001\u7535\u5b50\u90ae\u4ef6\u548c\u7535\u8bdd\u53f7\u7801\u3002\u4f60\u53ef\u4ee5\u4f7f\u7528 $_POST [&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-48262","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/48262","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=48262"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/48262\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=48262"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=48262"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=48262"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}