Compress images in PHP using GD

<?php
// Source: http://www.binarytides.com/compress-images-php-using-gd/

function compress_image($src, $dest , $quality)
{
    $info = getimagesize($src);

    if ($info['mime'] == 'image/jpeg')
    {
        $image = imagecreatefromjpeg($src);
    }
    elseif ($info['mime'] == 'image/gif')
    {
        $image = imagecreatefromgif($src);
    }
    elseif ($info['mime'] == 'image/png')
    {
        $image = imagecreatefrompng($src);
    }
    else
    {
        die('Unknown image file format');
    }

    //compress and save file to jpg
    imagejpeg($image, $dest, $quality);

    //return destination file
    return $dest;
}

//usage
$compressed = compress_image('boy.jpg', 'destination.jpg', 50);