DirectoryIterator::key()

(PHP 5,PHP 7)

Return the key for the current DirectoryIterator item

说明

publicDirectoryIterator::key(void) : string

Get the key for the currentDirectoryIteratoritem.

参数

此函数没有参数。

返回值

The key for the currentDirectoryIteratoritem.

范例

Example#1 ADirectoryIterator::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