返回所有可用的SPL类

# spl_classes

(PHP 5, PHP 7, PHP 8)

spl_classes — 返回所有可用的SPL类

### 说明

function spl_classes(): array

本函数返回当前所有可用的 SPL 类的数组。

### 参数

此函数没有参数。

### 返回值

Returns an array containing the currently available SPL classes.

### 示例

示例 #1 spl_classes() example

    <?php

    print_r(spl_classes());

    ?>

以上示例的输出类似于：

    Array
    (
        [ArrayObject] => ArrayObject
        [ArrayIterator] => ArrayIterator
        [CachingIterator] => CachingIterator
        [RecursiveCachingIterator] => RecursiveCachingIterator
        [DirectoryIterator] => DirectoryIterator
        [FilterIterator] => FilterIterator
        [LimitIterator] => LimitIterator
        [ParentIterator] => ParentIterator
        [RecursiveDirectoryIterator] => RecursiveDirectoryIterator
        [RecursiveIterator] => RecursiveIterator
        [RecursiveIteratorIterator] => RecursiveIteratorIterator
        [SeekableIterator] => SeekableIterator
        [SimpleXMLIterator] => SimpleXMLIterator
    )

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