{"id":890,"date":"2019-08-06T09:59:43","date_gmt":"2019-08-06T01:59:43","guid":{"rendered":"https:\/\/wyxxt.org.cn\/?p=890"},"modified":"2023-12-04T16:46:23","modified_gmt":"2023-12-04T08:46:23","slug":"php%e8%87%aa%e5%8a%a8%e5%8a%a0%e8%bd%bd%e9%85%8d%e7%bd%ae%e7%b1%bb-arrayaccess%e6%8e%a5%e5%8f%a3","status":"publish","type":"post","link":"https:\/\/wyxxt.org.cn\/?p=890","title":{"rendered":"PHP\u81ea\u52a8\u52a0\u8f7d\u914d\u7f6e\u7c7b-ArrayAccess\u63a5\u53e3"},"content":{"rendered":"<h3>\u90e8\u7f72ArrayAccess\u754c\u9762\uff0c\u53ef\u4ee5\u4f7f\u5f97object\u50cfarray\u90a3\u6837\u64cd\u4f5c\u3002ArrayAccess\u754c\u9762\u5305\u542b\u56db\u4e2a\u5fc5\u987b\u90e8\u7f72\u7684\u65b9\u6cd5<\/h3>\n<ol>\n<li>offsetExists($offset)<\/li>\n<li>offsetGet($offset)    ->    $object[$offset]<\/li>\n<li>offsetSet($offset, $value)<\/li>\n<li>offsetUnset($offset)<\/li>\n<\/ol>\n<h3>\u914d\u7f6e\u6587\u4ef6<\/h3>\n<pre><code class=\"language-php line-numbers\">\/\/ controller.php\n&lt;?php\nreturn [\n    'home' =&gt; [\n        'decorator' =&gt; [\n            'DesignPattern\\Decorator\\Template'\n        ]\n    ]\n];\n\n<\/code><\/pre>\n<h3>\u6838\u5fc3\u7c7b<\/h3>\n<pre><code class=\"language-php line-numbers\">\/\/ Config.php\n&lt;?php\n\nnamespace imooc;\n\nclass Config implements \\ArrayAccess\n{\n    protected $path;\n    protected $configs = array();\n    function __construct($path)\n    {\n        $this-&gt;path = $path;\n    }\n\n    \/**\n     * Defined by ArrayAccess interface\n     * Return a value given it's key e.g. echo $A['title'];\n     * @param mixed key (string or integer)\n     * @return mixed value\n     *\/\n    function offsetGet($offset)\n    {\n        if(empty($this-&gt;configs[$offset]))\n        {\n            $file_path = $this-&gt;path.'\/'.$offset.'.php';\n            $config = require $file_path;\n            $this-&gt;configs[$offset] = $config;\n        }\n        return $this-&gt;configs[$offset];\n    }\n    \/**\n     * Defined by ArrayAccess interface\n     * Set a value given it's key e.g. $A['title'] = 'foo';\n     * @param mixed key (string or integer)\n     * @param mixed value\n     * @return void\n     *\/\n    function offsetSet($offset, $value)\n    {\n        if ( array_key_exists($offset,get_object_vars($this)) ) {\n            $this-&gt;{$key} = $value;\n        }\n    }\n    \/**\n     * Defined by ArrayAccess interface\n     * Check value exists, given it's key e.g. isset($A['title'])\n     * @param mixed key (string or integer)\n     * @return boolean\n     *\/\n    function offsetExists($offset)\n    {\n        return array_key_exists($offset,get_object_vars($this));\n    }\n    \/**\n     * Defined by ArrayAccess interface\n     * Unset a value by it's key e.g. unset($A['title']);\n     * @param mixed key (string or integer)\n     * @return void\n     *\/\n    function offsetUnset($offset)\n    {\n        if ( array_key_exists($offset,get_object_vars($this)) ) {\n            unset($this-&gt;{$key});\n        }\n    }\n}\n<\/code><\/pre>\n<h3>\u4f7f\u7528\u5904<\/h3>\n<pre><code class=\"language-php line-numbers\">\/\/ index.php\n$config = new imooc\\Config(__DIR__.'.\/configs');\nvar_dump($config['controller']);\n\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u90e8\u7f72ArrayAccess\u754c\u9762\uff0c\u53ef\u4ee5\u4f7f\u5f97object\u50cfarray\u90a3\u6837\u64cd\u4f5c\u3002ArrayAccess\u754c\u9762\u5305\u542b\u56db\u4e2a\u5fc5 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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