November 15, 2011 - 1:36pm - by admin

$filename = 'sample.gif';



// 1. The "explode/end" approach

$ext = end(explode('.', $filename));



// 2. The "strrchr" approach

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



// 3. The "strrpos" approach

$ext = substr($filename, strrpos($filename, '.') + 1);



// 4. The "preg_replace" approach

$ext = preg_replace('/^.*\.([^.]+)$/D', '$1', $filename);



// 5. The "never use this" approach

//   From: http://php.about.com/od/finishedphp1/qt/file_ext_PHP.htm

$exts = split("[/\\.]", $filename);

$n = count($exts)-1;

$ext = $exts[$n];

$path_parts = pathinfo('/www/htdocs/inc/lib.inc.php');

echo $path_parts['dirname'], "\n";

echo $path_parts['basename'], "\n";

echo $path_parts['extension'], "\n";

echo $path_parts['filename'], "\n"; // since PHP 5.2.0

/www/htdocs/inc

lib.inc.php

php

lib.inc