DirectoryIterator::key
(PHP 5, PHP 7)
DirectoryIterator::key — Return the key for the current DirectoryIterator item
说明
public DirectoryIterator::key
( void
) : 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