How to strip file extension

function strip_ext($name)
{
$ext = strrchr($name, '.');

if($ext !== false)
{
$name = substr($name, 0, -strlen($ext));
}

return $name;
}

// demonstration
$filename = 'file_name.txt';
echo strip_ext($filename)."n";

// to get the file extension, do
echo end(explode('.',$filename))."n";