Php/docs/directoryiterator.key

• PHP Manual
• DirectoryIterator
• Return the key for the current DirectoryIterator item

DirectoryIterator::key

(PHP 5, PHP 7)

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

说明

public DirectoryIterator::key ( ) : string

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.

范例

Example #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

• DirectoryIterator::current() - Return the current DirectoryIterator item
• DirectoryIterator::next() - Move forward to next DirectoryIterator item
• DirectoryIterator::rewind() - Rewind the DirectoryIterator back to the start
• DirectoryIterator::valid() - Check whether current DirectoryIterator position is a valid file
• Iterator::key() - 返回当前元素的键