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                范圍解析操作符,可以簡單地說是一對冒號,可以用于訪問靜態成員、方法和常量,還可以用于覆蓋類中的成員和方法。 當在類的外部訪問這些靜態成員、方法和常量時,必須使用類的名字。 編輯`/home/project/paamayim.php` ~~~php <?php class A { const CONST_A = 'A constant value'; public static function sayHello() { echo 'Hello'; } } class B extends A { public static $b = 'static var b'; /** * 覆蓋父類方法 * */ public static function sayHello() { echo parent::sayHello().' World'.PHP_EOL; } public static function actionB() { self::sayHello(); echo parent::CONST_A.PHP_EOL; echo self::$b; } } B::actionB(); ~~~ 執行 ~~~bash php paamayim.php ~~~ 從結果可知 * 使用`parent`,`self`可以調用父類和自身的方法屬性 * `::`可以調用靜態方法,靜態屬性和常量
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