SplFileInfo
PHP Manual

SplFileInfo::getExtension

(PHP 5 >= 5.3.6, PHP 7)

SplFileInfo::getExtension — Gets the file extension

说明

public string SplFileInfo::getExtension ( void )

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.

范例

Example #1 SplFileInfo::getExtension() example

<?php

$info = new SplFileInfo('foo.txt');
var_dump($info->getExtension());

$info = new SplFileInfo('photo.jpg');
var_dump($info->getExtension());

$info = new SplFileInfo('something.tar.gz');
var_dump($info->getExtension());

?>

以上例程会输出：

string(3) "txt"
string(3) "jpg"
string(2) "gz"

注释

Note:

This method is only available as of PHP 5.3.6. Another way of getting the extension is to use the pathinfo() function.

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

参见

SplFileInfo
PHP Manual