{"id":47812,"date":"2024-12-02T09:30:54","date_gmt":"2024-12-02T01:30:54","guid":{"rendered":"https:\/\/fwq.ai\/blog\/47812\/"},"modified":"2024-12-02T09:30:54","modified_gmt":"2024-12-02T01:30:54","slug":"php-%e5%87%bd%e6%95%b0%e4%b8%ad%e5%93%aa%e4%ba%9b%e5%8f%98%e9%87%8f%e7%b1%bb%e5%9e%8b%e5%8f%af%e4%bb%a5%e5%9c%a8%e5%87%bd%e6%95%b0%e5%a4%96%e9%83%a8%e4%bf%ae%e6%94%b9%e4%bd%86%e4%b8%8d%e5%8f%af","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/47812\/","title":{"rendered":"PHP \u51fd\u6570\u4e2d\u54ea\u4e9b\u53d8\u91cf\u7c7b\u578b\u53ef\u4ee5\u5728\u51fd\u6570\u5916\u90e8\u4fee\u6539\u4f46\u4e0d\u53ef\u5728\u5185\u4fee\u6539\uff1f"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>PHP \u51fd\u6570\u4e2d\u54ea\u4e9b\u53d8\u91cf\u7c7b\u578b\u53ef\u4ee5\u5728\u51fd\u6570\u5916\u90e8\u4fee\u6539\u4f46\u4e0d\u53ef\u5728\u5185\u4fee\u6539\uff1f<\/h1>\n<p>\u76ee\u524d\u7c73\u4e91\u4e0a\u5df2\u7ecf\u6709\u5f88\u591a\u5173\u4e8e<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u6587\u7ae0<\/span>\u7684\u6587\u7ae0\u4e86\uff0c\u81ea\u5df1\u5728\u521d\u6b21\u9605\u8bfb\u8fd9\u4e9b\u6587\u7ae0\u4e2d\uff0c\u4e5f\u89c1\u8bc6\u5230\u4e86\u5f88\u591a\u5b66\u4e60\u601d\u8def\uff1b\u90a3\u4e48\u672c\u6587<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300aPHP \u51fd\u6570\u4e2d\u54ea\u4e9b\u53d8\u91cf\u7c7b\u578b\u53ef\u4ee5\u5728\u51fd\u6570\u5916\u90e8\u4fee\u6539\u4f46\u4e0d\u53ef\u5728\u5185\u4fee\u6539\uff1f\u300b<\/span>\uff0c\u4e5f\u5e0c\u671b\u80fd\u5e2e\u52a9\u5230\u5927\u5bb6\uff0c\u5982\u679c\u9605\u8bfb\u5b8c\u540e\u771f\u7684\u5bf9\u4f60\u5b66\u4e60<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u6587\u7ae0<\/span>\u6709\u5e2e\u52a9\uff0c\u6b22\u8fce\u52a8\u52a8\u624b\u6307\uff0c\u8bc4\u8bba\u7559\u8a00\u5e76\u5206\u4eab~<\/p>\n<p>\u5728 PHP \u4e2d\uff0c\u53ef\u4fee\u6539\u51fd\u6570\u5916\u7684\u53d8\u91cf\u7c7b\u578b\u6709\uff1a1. \u5168\u5c40\u53d8\u91cf\uff08\u58f0\u660e\u540e\u53ef\u7528 global \u5173\u952e\u5b57\u8bbf\u95ee\uff09\uff1b2. \u9759\u6001\u53d8\u91cf\uff08\u58f0\u660e\u540e\u4f7f\u7528 static \u5173\u952e\u5b57\u521d\u59cb\u5316\uff09\uff1b3. \u5f15\u7528\u53c2\u6570\uff08\u901a\u8fc7 &amp; \u7b26\u53f7\u4f20\u9012\uff0c\u53ef\u4fee\u6539\u539f\u59cb\u53d8\u91cf\uff09\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241026\/1729937621671cc0d5b666f.jpg\" class=\"aligncenter\" title=\"PHP \u51fd\u6570\u4e2d\u54ea\u4e9b\u53d8\u91cf\u7c7b\u578b\u53ef\u4ee5\u5728\u51fd\u6570\u5916\u90e8\u4fee\u6539\u4f46\u4e0d\u53ef\u5728\u5185\u4fee\u6539\uff1f\u63d2\u56fe\" alt=\"PHP \u51fd\u6570\u4e2d\u54ea\u4e9b\u53d8\u91cf\u7c7b\u578b\u53ef\u4ee5\u5728\u51fd\u6570\u5916\u90e8\u4fee\u6539\u4f46\u4e0d\u53ef\u5728\u5185\u4fee\u6539\uff1f\u63d2\u56fe\" \/><\/p>\n<p><strong>PHP \u4e2d\u53ef\u5728\u51fd\u6570\u5916\u90e8\u4fee\u6539\u4f46\u4e0d\u53ef\u5728\u51fd\u6570\u5185\u90e8\u4fee\u6539\u7684\u53d8\u91cf\u7c7b\u578b<\/strong><\/p>\n<p>\u5728 PHP \u4e2d\uff0c\u6709\u51e0\u79cd\u53d8\u91cf\u7c7b\u578b\u53ef\u4ee5\u5728\u51fd\u6570\u5916\u90e8\u4fee\u6539\uff0c\u4f46\u4e0d\u80fd\u5728\u51fd\u6570\u5185\u90e8\u4fee\u6539\u3002\u8fd9\u4e9b\u7c7b\u578b\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>\u5168\u5c40\u53d8\u91cf\uff1a<\/strong>\u4ee5 <code>global<\/code> \u5173\u952e\u5b57\u58f0\u660e\uff0c\u53ef\u4ee5\u5728\u51fd\u6570\u7684\u4efb\u4f55\u4f4d\u7f6e\u8bbf\u95ee\u548c\u4fee\u6539\u3002<\/li>\n<li><strong>\u9759\u6001\u53d8\u91cf\uff1a<\/strong>\u4f7f\u7528 <code>static<\/code> \u5173\u952e\u5b57\u58f0\u660e\uff0c\u5728\u51fd\u6570\u7b2c\u4e00\u6b21\u6267\u884c\u65f6\u521d\u59cb\u5316\uff0c\u5e76\u5728\u51fd\u6570\u968f\u540e\u7684\u8c03\u7528\u4e2d\u4fdd\u7559\u5176\u503c\u3002<\/li>\n<li><strong>\u5f15\u7528\u53c2\u6570\uff1a<\/strong>\u4f5c\u4e3a\u51fd\u6570\u53c2\u6570\u4f20\u9012\uff0c\u5141\u8bb8\u51fd\u6570\u76f4\u63a5\u4fee\u6539\u539f\u59cb\u53d8\u91cf\u3002<\/li>\n<\/ul>\n<p><strong>\u5b9e\u6218\u6848\u4f8b\uff1a<\/strong><\/p>\n<p>\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u51fd\u6570 <code>modifyVariable()<\/code>, \u5b83\u9700\u8981\u4fee\u6539\u4e00\u4e2a\u5916\u90e8\u5168\u5c40\u53d8\u91cf <code>$global_var<\/code>\u3002<\/p>\n<pre>\/\/ \u5168\u5c40\u53d8\u91cf\uff0c\u9ed8\u8ba4\u503c\u4e3a 0\n$global_var = 0;\n\nfunction modifyVariable() {\n  global $global_var;  \/\/ \u58f0\u660e\u5168\u5c40\u53d8\u91cf\n  $global_var++;  \/\/ \u589e\u52a0 $global_var \u7684\u503c\n}\n\nmodifyVariable();\necho $global_var;  \/\/ \u8f93\u51fa\u4fee\u6539\u540e\u7684 $global_var\uff0c\u7ed3\u679c\u4e3a 1<\/pre>\n<p>\u5728\u672c\u4f8b\u4e2d\uff0c\u51fd\u6570 <code>modifyVariable()<\/code> \u80fd\u591f\u4fee\u6539\u5168\u5c40\u53d8\u91cf <code>$global_var<\/code>\uff0c\u56e0\u4e3a\u4f7f\u7528 <code>global<\/code> \u5173\u952e\u5b57\u58f0\u660e\u4e86\u8be5\u53d8\u91cf\u3002<\/p>\n<p><strong>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff1a<\/strong><\/p>\n<ul>\n<li>\u51fd\u6570\u4e2d\u4e0d\u53ef\u4fee\u6539\u7684\u5c40\u90e8\u53d8\u91cf\uff0c\u5f53\u91cd\u65b0\u5b9a\u4e49\u6216\u91cd\u65b0\u8d4b\u503c\u65f6\uff0c\u53ea\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5c40\u90e8\u526f\u672c\u3002<\/li>\n<li>\u5f15\u7528\u53c2\u6570\u5fc5\u987b\u4f7f\u7528 <code>&amp;<\/code> \u7b26\u53f7\u4f20\u9012\uff0c\u624d\u80fd\u5728\u51fd\u6570\u5185\u4fee\u6539\u539f\u59cb\u53d8\u91cf\u3002<\/li>\n<\/ul>\n<p>\u672c\u7bc7\u5173\u4e8e\u300aPHP \u51fd\u6570\u4e2d\u54ea\u4e9b\u53d8\u91cf\u7c7b\u578b\u53ef\u4ee5\u5728\u51fd\u6570\u5916\u90e8\u4fee\u6539\u4f46\u4e0d\u53ef\u5728\u5185\u4fee\u6539\uff1f\u300b\u7684\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\u5566\uff0c\u4f46\u662f\u5b66\u65e0\u6b62\u5883\uff0c\u60f3\u8981\u4e86\u89e3\u5b66\u4e60\u66f4\u591a\u5173\u4e8e\u6587\u7ae0\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u8bf7\u5173\u6ce8\u7c73\u4e91\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>PHP \u51fd\u6570\u4e2d\u54ea\u4e9b\u53d8\u91cf\u7c7b\u578b\u53ef\u4ee5\u5728\u51fd\u6570\u5916\u90e8\u4fee\u6539\u4f46\u4e0d\u53ef\u5728\u5185\u4fee\u6539\uff1f \u76ee\u524d\u7c73\u4e91\u4e0a\u5df2\u7ecf\u6709\u5f88\u591a\u5173\u4e8e\u6587\u7ae0\u7684\u6587\u7ae0\u4e86\uff0c\u81ea\u5df1\u5728\u521d\u6b21\u9605\u8bfb\u8fd9\u4e9b\u6587\u7ae0\u4e2d\uff0c\u4e5f\u89c1\u8bc6\u5230\u4e86\u5f88\u591a\u5b66\u4e60\u601d\u8def\uff1b\u90a3\u4e48\u672c\u6587\u300aPHP \u51fd\u6570\u4e2d\u54ea\u4e9b\u53d8\u91cf\u7c7b\u578b\u53ef\u4ee5\u5728\u51fd\u6570\u5916\u90e8\u4fee\u6539\u4f46\u4e0d\u53ef\u5728\u5185\u4fee\u6539\uff1f\u300b\uff0c\u4e5f\u5e0c\u671b\u80fd\u5e2e\u52a9\u5230\u5927\u5bb6\uff0c\u5982\u679c\u9605\u8bfb\u5b8c\u540e\u771f\u7684\u5bf9\u4f60\u5b66\u4e60\u6587\u7ae0\u6709\u5e2e\u52a9\uff0c\u6b22\u8fce\u52a8\u52a8\u624b\u6307\uff0c\u8bc4\u8bba\u7559\u8a00\u5e76\u5206\u4eab~ \u5728 PHP \u4e2d\uff0c\u53ef\u4fee\u6539\u51fd\u6570\u5916\u7684\u53d8\u91cf\u7c7b\u578b\u6709\uff1a1. \u5168\u5c40\u53d8\u91cf\uff08\u58f0\u660e\u540e\u53ef\u7528 global \u5173\u952e\u5b57\u8bbf\u95ee\uff09\uff1b2. \u9759\u6001\u53d8\u91cf\uff08\u58f0\u660e\u540e\u4f7f\u7528 static \u5173\u952e\u5b57\u521d\u59cb\u5316\uff09\uff1b3. \u5f15\u7528\u53c2\u6570\uff08\u901a\u8fc7 &amp; \u7b26\u53f7\u4f20\u9012\uff0c\u53ef\u4fee\u6539\u539f\u59cb\u53d8\u91cf\uff09\u3002 PHP \u4e2d\u53ef\u5728\u51fd\u6570\u5916\u90e8\u4fee\u6539\u4f46\u4e0d\u53ef\u5728\u51fd\u6570\u5185\u90e8\u4fee\u6539\u7684\u53d8\u91cf\u7c7b\u578b \u5728 PHP \u4e2d\uff0c\u6709\u51e0\u79cd\u53d8\u91cf\u7c7b\u578b\u53ef\u4ee5\u5728\u51fd\u6570\u5916\u90e8\u4fee\u6539\uff0c\u4f46\u4e0d\u80fd\u5728\u51fd\u6570\u5185\u90e8\u4fee\u6539\u3002\u8fd9\u4e9b\u7c7b\u578b\u5305\u62ec\uff1a \u5168\u5c40\u53d8\u91cf\uff1a\u4ee5 global \u5173\u952e\u5b57\u58f0\u660e\uff0c\u53ef\u4ee5\u5728\u51fd\u6570\u7684\u4efb\u4f55\u4f4d\u7f6e\u8bbf\u95ee\u548c\u4fee\u6539\u3002 \u9759\u6001\u53d8\u91cf\uff1a\u4f7f\u7528 static \u5173\u952e\u5b57\u58f0\u660e\uff0c\u5728\u51fd\u6570\u7b2c\u4e00\u6b21\u6267\u884c\u65f6\u521d\u59cb\u5316\uff0c\u5e76\u5728\u51fd\u6570\u968f\u540e\u7684\u8c03\u7528\u4e2d\u4fdd\u7559\u5176\u503c\u3002 \u5f15\u7528\u53c2\u6570\uff1a\u4f5c\u4e3a\u51fd\u6570\u53c2\u6570\u4f20\u9012\uff0c\u5141\u8bb8\u51fd\u6570\u76f4\u63a5\u4fee\u6539\u539f\u59cb\u53d8\u91cf\u3002 \u5b9e\u6218\u6848\u4f8b\uff1a \u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u51fd\u6570 modifyVariable(), \u5b83\u9700\u8981\u4fee\u6539\u4e00\u4e2a\u5916\u90e8\u5168\u5c40\u53d8\u91cf $global_var\u3002 \/\/ \u5168\u5c40\u53d8\u91cf\uff0c\u9ed8\u8ba4\u503c\u4e3a 0 $global_var = 0; function modifyVariable() { global $global_var; \/\/ \u58f0\u660e\u5168\u5c40\u53d8\u91cf $global_var++; \/\/ \u589e\u52a0 $global_var \u7684\u503c } modifyVariable(); echo $global_var; [&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-47812","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/47812","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=47812"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/47812\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=47812"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=47812"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=47812"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}