# FilesystemIterator::key

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

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

### 说明

public 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()

`↑` and `↓` to navigate • `Enter` to select • `Esc` to close • `/` to open