My Javascript and PHP Way to Extract the File Extension

Javascript:

var extension; var filename = "test.my.txt"; var ext = filename.split("."); if (ext[1] != "") {      extension = ext[ext.length-1]; } // extension will contain "txt"

PHP:

$fullfilename = "test.my.txt"; preg_match("/(.+)\.([^\.]+)$/",$fullfilename,$match); $filename = $match[1]; $extension = $match[2]; // $extension will contain "txt"

I think the codes are very self-explanatory. Enjoy!!!