How to get file extensions in PHP

admin — Thu, 21 May 2009 09:22:22 +0000

There are several methods get a file extension using PHP:


$filename = 'myfile.jpg';
 
// 1. The "explode/end" method
$ext = end(explode('.', $filename));
 
// 2. The "strrchr" method
$ext = substr(strrchr($filename, '.'), 1);
 
// 3. The "strrpos" method
$ext = substr($filename, strrpos($filename, '.') + 1);
 
// 4. The "preg_replace" method
$ext = preg_replace('/^.*\.([^.]+)$/D', '$1', $filename);
 
// 5. The "never use this" method
//   From: http://php.about.com/od/finishedphp1/qt/file_ext_PHP.htm
$exts = split("[/\\.]", $filename);
$n = count($exts)-1;
$ext = $exts[$n];
?>

PHP find file extension

admin — Tue, 07 Apr 2009 22:49:54 +0000

This simple code example uses a combination of strrchr to find the last occurrence of a string and substr to return part of the string in order to find the file extension for a given filename. This is ideal if you want to quickly find a file extension.

$ext = substr(strrchr($fileName, '.'), 1);

This code can be used in the following way.

$fileName = '\path\to\file\afile.jpg';
$ext = substr(strrchr($fileName, '.'), 1);
echo $ext;

The output here is ‘jpg’;

Ersin Acar » extension

How to get file extensions in PHP

PHP find file extension