DirectoryIterator::key
(PHP 5, PHP 7, PHP 8)
DirectoryIterator::key — Return 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.
|
示例
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";
}
}
?>以上示例的输出类似于：
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
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