Gets the file extension

# DirectoryIterator::getExtension

(PHP 5 >= 5.3.6, PHP 7, PHP 8)

DirectoryIterator::getExtension — Gets the file extension

### 说明

public function DirectoryIterator::getExtension(): string

Retrieves the file extension.

### 参数

此函数没有参数。

### 返回值

Returns a string containing the file extension, or an empty string if the file has no extension.

### 示例

示例 #1 DirectoryIterator::getExtension() example

    <?php

    $directory = new DirectoryIterator(__DIR__);
    foreach ($directory as $fileinfo) {
        if ($fileinfo->isFile()) {
            echo $fileinfo->getExtension() . "\n";
        }
    }

    ?>

以上示例的输出类似于：

    php
    txt
    jpg
    gz

### 注释

> 注意:

> Another way of getting the extension is to use the pathinfo() function.

>     <?php
>     $extension = pathinfo($fileinfo->getFilename(), PATHINFO_EXTENSION);
>     ?>

### 参见

- DirectoryIterator::getFilename() - Return file name of current DirectoryIterator item
- DirectoryIterator::getBasename() - Get base name of current DirectoryIterator item
- pathinfo() - 返回文件路径的信息

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