Retrieve the key for the current file

# FilesystemIterator::key

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

FilesystemIterator::key — Retrieve the key for the current file

### 说明

public function FilesystemIterator::key(): string

### 参数

此函数没有参数。

### 返回值

Returns the pathname or filename depending on the set flags. See the FilesystemIterator constants.

### 示例

示例 #1 FilesystemIterator::key() example

This example will list the contents of the directory containing the script.

    <?php
    $iterator = new FilesystemIterator(dirname(__FILE__), FilesystemIterator::KEY_AS_FILENAME);
    foreach ($iterator as $fileinfo) {
        echo $iterator->key() . "\n";
    }
    ?>

上述示例在 PHP 8.2 中的输出类似于：

    .
    ..
    apple.jpg
    banana.jpg
    example.php

### 参见

- FilesystemIterator constants
- DirectoryIterator::key() - Return the key for the current DirectoryIterator item
- DirectoryIterator::getFilename() - Return file name of current DirectoryIterator item
- DirectoryIterator::getPathname()

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