DirectoryIterator::key

(PHP 5, PHP 7, PHP 8)

DirectoryIterator::key — Return the key for the current DirectoryIterator item

说明

public DirectoryIterator::key(): mixed

Get the key for the current DirectoryIterator item.

参数

此函数没有参数。

返回值

The key for the current DirectoryIterator item as an int.

更新日志

版本 说明
8.1.0 When the iterator is uninitialized, an Error is thrown now. Previously, the method returned false.

范例

示例 #1 A DirectoryIterator::key() example

<?php
$dir = new DirectoryIterator(dirname(__FILE__));
foreach ($dir as $fileinfo) {
    if (!$fileinfo->isDot()) {
        echo $fileinfo->key() . " => " . $fileinfo->getFilename() . "\n";
    }
}
?>

以上例程的输出类似于：

0 => apple.jpg
1 => banana.jpg
2 => index.php
3 => pear.jpg

参见