php压缩图片

function compressImage($source, $destination, $quality) {
        // Get image info
        $imgInfo = getimagesize($source);
        $mime = $imgInfo['mime'];

        // Create a new image from file
        switch($mime){
            case 'image/jpeg':
                $image = imagecreatefromjpeg($source);
                break;
            case 'image/png':
                $image = imagecreatefrompng($source);
                break;
            case 'image/gif':
                $image = imagecreatefromgif($source);
                break;
            default:
                $image = imagecreatefromjpeg($source);
        }

        // Save image
        imagejpeg($image, $destination, $quality);

        // Return compressed image
        return $destination;
    }