find file extension in PHP

<?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());

?>



The above example will output:

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