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                # [**預定義類**](https://www.php.net/manual/zh/reserved.classes.php) ## **標準類** 這些類由一些內建在 PHP 中的標準函數定義 ### [Directory](https://www.php.net/manual/zh/class.directory.php) >[info]由[dir()](https://www.php.net/manual/zh/function.dir.php)函數創建并返回的對象. ### **stdClass** >[info]通過類型轉換到對象創建或直接new stdClass; ### **\_\_PHP\_Incomplete\_Class** >[info]unserialize()函數創建并返回的對象 ## **PHP 5 起預定義的類** 這些額外的預定義類是 PHP 5.0.0 引進的 ### [**exception**](https://www.php.net/manual/zh/class.exception.php) ### [**ErrorException**](https://www.php.net/manual/zh/class.errorexception.php):自PHP 5.1.0起可用 ### [**php\_user\_filter**](https://www.php.net/manual/zh/class.php-user-filter.php) ### **Closure** >[info]PHP5.3.0中引入了一個預定義的final類[Closure](https://www.php.net/manual/zh/class.closure.php),它可以用于實現[匿名函數](https://www.php.net/manual/zh/functions.anonymous.php) ### **Generator** >[info]預定義的最終類生成器在PHP 5.5.0中引入。 它用于表示[生成器generators](https://www.php.net/manual/zh/language.generators.php)。有關更多信息,請參見其[類頁面](https://www.php.net/manual/zh/class.generator.php). ## **PHP 7開始預定義的類和接口** 這些預定義的類和接口是在PHP 7.0.0 中開始引入的。 **ArithmeticError** **AssertionError** **DivisionByZeroError** **Error** **Throwable** **ParseError** **TypeError** ## **特殊的類** 以下這些標識符由于它們有特殊的用處,因此不可作為類名 ### **self** >[info][Current class](https://www.php.net/manual/zh/language.oop5.paamayim-nekudotayim.php). ### **static** >[info][Current class in runtime](https://www.php.net/manual/zh/language.oop5.late-static-bindings.php). ### **parent** >[info][Parent class](https://www.php.net/manual/zh/language.oop5.paamayim-nekudotayim.php).
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