Optimize Image with php

optimize_image.php

<?php

function image_optimize ($source_url, $destination_url, $quality) {
    $info = getimagesize($source_url);

    if ($info['mime'] == 'image/jpeg') $image = imagecreatefromjpeg($source_url);
    elseif ($info['mime'] == 'image/png') $image = imagecreatefrompng($source_url);
    else return 'error: only jpeg and png are supported';

    // Enable interlancing
    imageinterlace($image, true);

    $png_quality = intval((($quality / 10)-10)*(-0.9));

    //save file
    if ($info['mime'] == 'image/jpeg') imagejpeg($image, $destination_url, $quality);
    elseif ($info['mime'] == 'image/png') imagepng($image, $destination_url, $png_quality);

    //return destination file
    return $destination_url;
}
image_optimize('original/file.jpg','klein/file.jpg',75);
?>