DirectoryIterator::key

    (PHP 5, PHP 7, PHP 8)

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

    说明

    publicDirectoryIterator::key(): mixed

    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 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

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