array ( 0 => 'index.php', 1 => 'PHP Manual', ), 'head' => array ( 0 => 'UTF-8', 1 => 'zh', ), 'this' => array ( 0 => 'directoryiterator.key.php', 1 => 'DirectoryIterator::key', ), 'up' => array ( 0 => 'class.directoryiterator.php', 1 => 'DirectoryIterator', ), 'prev' => array ( 0 => 'directoryiterator.isdot.php', 1 => 'DirectoryIterator::isDot', ), 'next' => array ( 0 => 'directoryiterator.next.php', 1 => 'DirectoryIterator::next', ), 'alternatives' => array ( ), 'source' => array ( 'lang' => 'en', 'path' => 'reference/spl/directoryiterator/key.xml', ), ); $setup["toc"] = $TOC; $setup["toc_deprecated"] = $TOC_DEPRECATED; $setup["parents"] = $PARENTS; manual_setup($setup); ?>
(PHP 5, PHP 7, PHP 8)
DirectoryIterator::key — Return the key for the current DirectoryIterator item
此函数没有参数。
The key for the current DirectoryIterator item as an int.
版本 | 说明 |
---|---|
8.1.0 |
When the iterator is uninitialized, an Error is
thrown now. Previously, the method returned false .
|
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