{"id":3003,"date":"2025-03-19T21:53:46","date_gmt":"2025-03-19T13:53:46","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=3003"},"modified":"2025-03-19T22:32:14","modified_gmt":"2025-03-19T14:32:14","slug":"php-%e5%91%bd%e5%90%8d%e7%a9%ba%e9%97%b4%ef%bc%88namespace%ef%bc%89%e5%ae%8c%e6%95%b4%e6%8c%87%e5%8d%97","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/03\/19\/php-%e5%91%bd%e5%90%8d%e7%a9%ba%e9%97%b4%ef%bc%88namespace%ef%bc%89%e5%ae%8c%e6%95%b4%e6%8c%87%e5%8d%97\/","title":{"rendered":"PHP \u547d\u540d\u7a7a\u95f4\uff08Namespace\uff09"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">1. <strong>\u4ec0\u4e48\u662f PHP \u547d\u540d\u7a7a\u95f4\uff1f<\/strong><\/h2>\n\n\n\n<p>PHP <strong>\u547d\u540d\u7a7a\u95f4\uff08Namespace\uff09<\/strong> \u7528\u4e8e\u7ec4\u7ec7\u4ee3\u7801\uff0c\u9632\u6b62 <strong>\u7c7b\u3001\u51fd\u6570\u548c\u5e38\u91cf<\/strong> \u7684\u547d\u540d\u51b2\u7a81\u3002<\/p>\n\n\n\n<p>\u2705 <strong>\u4f5c\u7528\uff1a<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u907f\u514d\u547d\u540d\u51b2\u7a81<\/strong>\uff08\u7279\u522b\u662f\u5f53\u591a\u4e2a\u5e93\/\u6846\u67b6\u4e00\u8d77\u4f7f\u7528\u65f6\uff09<\/li>\n\n\n\n<li><strong>\u63d0\u9ad8\u4ee3\u7801\u7684\u7ec4\u7ec7\u6027<\/strong>\uff08\u66f4\u597d\u5730\u7ba1\u7406\u7c7b\u3001\u51fd\u6570\u3001\u5e38\u91cf\uff09<\/li>\n\n\n\n<li><strong>\u652f\u6301\u81ea\u52a8\u52a0\u8f7d<\/strong>\uff08\u7ed3\u5408 <code>spl_autoload_register<\/code> \u4f7f\u7528\uff09<\/li>\n<\/ol>\n\n\n\n<p>\u2705 <strong>\u9002\u7528\u4e8e\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5927\u578b\u9879\u76ee\uff08\u5982 Laravel\u3001Symfony \u7b49\u6846\u67b6\uff09<\/li>\n\n\n\n<li>\u9700\u8981\u96c6\u6210\u591a\u4e2a\u5e93\u7684\u9879\u76ee<\/li>\n\n\n\n<li>\u4ee3\u7801\u6a21\u5757\u5316\u5f00\u53d1<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">2. <strong>\u57fa\u672c\u8bed\u6cd5<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u5b9a\u4e49\u547d\u540d\u7a7a\u95f4<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nnamespace MyApp;\n\nclass MyClass {\n    function sayHello() {\n        return \"Hello from MyApp\\\\MyClass!\";\n    }\n}\n?&gt;<\/code><\/pre>\n\n\n\n<p>\ud83d\udd39 <strong>\u8bf4\u660e<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>namespace MyApp;<\/code> \u58f0\u660e <code>MyApp<\/code> \u4f5c\u4e3a\u547d\u540d\u7a7a\u95f4<\/li>\n\n\n\n<li><code>MyClass<\/code> \u5c5e\u4e8e <code>MyApp<\/code> \u547d\u540d\u7a7a\u95f4<\/li>\n\n\n\n<li><code>MyClass<\/code> \u53ea\u80fd\u5728 <code>MyApp<\/code> \u4f5c\u7528\u57df\u4e0b\u8bbf\u95ee<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">3. <strong>\u4f7f\u7528\u547d\u540d\u7a7a\u95f4\u7684\u7c7b<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u8bbf\u95ee\u5e26\u547d\u540d\u7a7a\u95f4\u7684\u7c7b<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nrequire 'MyClass.php';  \/\/ \u5f15\u5165\u6587\u4ef6\n\n$obj = new MyApp\\MyClass();  \/\/ \u4f7f\u7528\u5b8c\u6574\u547d\u540d\u7a7a\u95f4\necho $obj-&gt;sayHello();\n?&gt;<\/code><\/pre>\n\n\n\n<p>\ud83d\udd39 <strong>\u8f93\u51fa<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Hello from MyApp\\MyClass!<\/code><\/pre>\n\n\n\n<p>\u2705 <strong>\u6ce8\u610f<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9700\u8981\u4f7f\u7528 <code>\u5b8c\u6574\u9650\u5b9a\u540d\u79f0\uff08Fully Qualified Name\uff09<\/code><\/li>\n\n\n\n<li>\u5373 <strong><code>\u547d\u540d\u7a7a\u95f4 + \u7c7b\u540d<\/code><\/strong> (<code>MyApp\\MyClass<\/code>)<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">4. <strong>\u4f7f\u7528 <code>use<\/code> \u5173\u952e\u5b57<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u7b80\u5316\u547d\u540d\u7a7a\u95f4\u7684\u4f7f\u7528<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nrequire 'MyClass.php';\n\nuse MyApp\\MyClass;\n\n$obj = new MyClass();  \/\/ \u7701\u7565\u547d\u540d\u7a7a\u95f4\necho $obj-&gt;sayHello();\n?&gt;<\/code><\/pre>\n\n\n\n<p>\u2705 <strong>\u597d\u5904<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4ee3\u7801\u66f4\u7b80\u6d01\uff0c\u4e0d\u7528\u5199\u5b8c\u6574\u8def\u5f84<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">5. <strong>\u591a\u4e2a\u547d\u540d\u7a7a\u95f4<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u5355\u4e2a PHP \u6587\u4ef6\u4e2d\u7684\u591a\u4e2a\u547d\u540d\u7a7a\u95f4<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nnamespace FirstNamespace;\nclass FirstClass {\n    function hello() {\n        return \"Hello from FirstNamespace\";\n    }\n}\n\nnamespace SecondNamespace;\nclass SecondClass {\n    function hello() {\n        return \"Hello from SecondNamespace\";\n    }\n}\n\n\/\/ \u8bbf\u95ee\u547d\u540d\u7a7a\u95f4\u4e2d\u7684\u7c7b\n$obj1 = new \\FirstNamespace\\FirstClass();\necho $obj1-&gt;hello(); \/\/ \u8f93\u51fa: Hello from FirstNamespace\n\n$obj2 = new \\SecondNamespace\\SecondClass();\necho $obj2-&gt;hello(); \/\/ \u8f93\u51fa: Hello from SecondNamespace\n?&gt;<\/code><\/pre>\n\n\n\n<p>\u2705 <strong>\u6ce8\u610f<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>namespace<\/code> \u9700\u8981 <strong>\u72ec\u7acb\u58f0\u660e<\/strong><\/li>\n\n\n\n<li>\u8bbf\u95ee\u65f6\u9700\u52a0 <code>\\<\/code> \u5168\u5c40\u9650\u5b9a\u540d\u79f0<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">6. <strong>\u547d\u540d\u7a7a\u95f4\u7684\u51fd\u6570 &amp; \u5e38\u91cf<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u5728\u547d\u540d\u7a7a\u95f4\u4e2d\u5b9a\u4e49\u51fd\u6570<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nnamespace MyApp;\n\nfunction sayHello() {\n    return \"Hello from MyApp function!\";\n}\n?&gt;<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u8bbf\u95ee\u547d\u540d\u7a7a\u95f4\u51fd\u6570<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nrequire 'functions.php';\n\necho \\MyApp\\sayHello(); \/\/ \u9700\u8981\u5b8c\u6574\u8def\u5f84\n?&gt;<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">7. <strong><code>namespace<\/code> \u4e0e <code>use<\/code> \u7ed3\u5408<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u4f7f\u7528 <code>as<\/code> \u7ed9\u547d\u540d\u7a7a\u95f4\u522b\u540d<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nrequire 'MyClass.php';\n\nuse MyApp\\MyClass as MyAlias;\n\n$obj = new MyAlias();\necho $obj-&gt;sayHello();\n?&gt;<\/code><\/pre>\n\n\n\n<p>\u2705 <strong>\u597d\u5904<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>MyApp\\MyClass<\/code> \u53d8\u6210 <code>MyAlias<\/code><\/li>\n\n\n\n<li>\u65b9\u4fbf\u5904\u7406 <strong>\u5197\u957f\u7684\u547d\u540d\u7a7a\u95f4<\/strong><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">8. <strong>PHP \u9884\u5b9a\u4e49\u547d\u540d\u7a7a\u95f4<\/strong><\/h2>\n\n\n\n<p>PHP \u81ea\u5e26\u4e86\u4e00\u4e9b\u547d\u540d\u7a7a\u95f4\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u9884\u5b9a\u4e49\u547d\u540d\u7a7a\u95f4<\/th><th>\u4f5c\u7528<\/th><\/tr><\/thead><tbody><tr><td><code>\\Exception<\/code><\/td><td>\u5168\u5c40\u5f02\u5e38<\/td><\/tr><tr><td><code>\\stdClass<\/code><\/td><td>PHP \u9ed8\u8ba4\u5bf9\u8c61<\/td><\/tr><tr><td><code>\\DateTime<\/code><\/td><td>\u5904\u7406\u65e5\u671f<\/td><\/tr><tr><td><code>\\PDO<\/code><\/td><td>\u8fde\u63a5\u6570\u636e\u5e93<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u2705 <strong>\u793a\u4f8b<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\n$datetime = new \\DateTime(); \/\/ \u8bbf\u95ee PHP \u5185\u7f6e DateTime \u7c7b\necho $datetime-&gt;format('Y-m-d');\n?&gt;<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">9. <strong>\u81ea\u52a8\u52a0\u8f7d\u547d\u540d\u7a7a\u95f4<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u4f7f\u7528 <code>spl_autoload_register<\/code> \u81ea\u52a8\u52a0\u8f7d\u7c7b<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nspl_autoload_register(function ($class) {\n    include str_replace(\"\\\\\", \"\/\", $class) . '.php';\n});\n?&gt;<\/code><\/pre>\n\n\n\n<p>\u2705 <strong>\u4f5c\u7528<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u81ea\u52a8\u52a0\u8f7d <code>MyApp\\MyClass<\/code> -> <code>MyApp\/MyClass.php<\/code><\/li>\n\n\n\n<li>\u907f\u514d <code>require<\/code> \u592a\u591a\u6587\u4ef6<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">10. <strong>\u603b\u7ed3<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>\u529f\u80fd<\/strong><\/th><th><strong>\u7528\u6cd5<\/strong><\/th><\/tr><\/thead><tbody><tr><td>\u5b9a\u4e49\u547d\u540d\u7a7a\u95f4<\/td><td><code>namespace MyApp;<\/code><\/td><\/tr><tr><td>\u4f7f\u7528\u5b8c\u6574\u8def\u5f84<\/td><td><code>new \\MyApp\\MyClass();<\/code><\/td><\/tr><tr><td><code>use<\/code> \u5173\u952e\u5b57<\/td><td><code>use MyApp\\MyClass;<\/code><\/td><\/tr><tr><td>\u591a\u4e2a\u547d\u540d\u7a7a\u95f4<\/td><td><code>namespace A; namespace B;<\/code><\/td><\/tr><tr><td>\u7ed9\u547d\u540d\u7a7a\u95f4\u53d6\u522b\u540d<\/td><td><code>use MyApp\\MyClass as Alias;<\/code><\/td><\/tr><tr><td>\u547d\u540d\u7a7a\u95f4\u51fd\u6570<\/td><td><code>namespace MyApp; function myFunc() {}<\/code><\/td><\/tr><tr><td>\u9884\u5b9a\u4e49\u547d\u540d\u7a7a\u95f4<\/td><td><code>\\Exception<\/code>, <code>\\DateTime<\/code><\/td><\/tr><tr><td>\u81ea\u52a8\u52a0\u8f7d\u7c7b<\/td><td><code>spl_autoload_register(function ($class) {...});<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\ud83d\udd17 <strong>\u63a8\u8350\u9605\u8bfb<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.php.net\/manual\/zh\/language.namespaces.php\">PHP \u5b98\u65b9\u6587\u6863 &#8211; \u547d\u540d\u7a7a\u95f4<\/a><\/li>\n<\/ul>\n\n\n\n<p>\u66f4\u591a\u8be6\u7ec6\u5185\u5bb9\u8bf7\u5173\u6ce8\u5176\u4ed6\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>1. \u4ec0\u4e48\u662f PHP \u547d\u540d\u7a7a\u95f4\uff1f PHP \u547d\u540d\u7a7a\u95f4\uff08Namespace\uff09 \u7528\u4e8e\u7ec4\u7ec7\u4ee3\u7801\uff0c\u9632\u6b62 \u7c7b\u3001\u51fd\u6570\u548c\u5e38\u91cf  [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3004,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[80],"tags":[],"class_list":["post-3003","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-php"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3003","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=3003"}],"version-history":[{"count":2,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3003\/revisions"}],"predecessor-version":[{"id":3047,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3003\/revisions\/3047"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media\/3004"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=3003"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=3003"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=3003"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}