EasyImage::crop PHP Method

    public function crop($width, $height, $offset_x = null, $offset_y = null)
    {
        return $this->image()->crop($width, $height, $offset_x, $offset_y);
    }

 public static function createThumb($param)
 {
     if ($param['image'] != '') {
         $root = $_SERVER['DOCUMENT_ROOT'];
         $onlyImgLink = urldecode(str_replace($param['imageDir'], '', $param['image']));
         $img = $root . '/' . $param['imageDir'] . $onlyImgLink;
         if (file_exists($img)) {
             // replace space pada gambar
             $thumbName = self::cleanImgName($onlyImgLink);
             $thumbDir = dirname($root . $param['thumbDir'] . $onlyImgLink);
             // get direktori image basename
             $thumbDir = self::cleanDirName($thumbDir);
             if (!is_dir($thumbDir)) {
                 // create directory thumb image
                 mkdir($thumbDir, 0755, true);
             }
             //create small thumb
             if (isset($param['small'])) {
                 $image = new EasyImage($img);
                 $image->resize(100, 100, EasyImage::RESIZE_HEIGHT);
                 $image->crop(100, 100, 0, 0);
                 $image->save($thumbDir . '/small-' . $thumbName);
             }
             // create medium thumb
             if (isset($param['medium'])) {
                 $image = new EasyImage($img);
                 if (!empty($_POST['w'])) {
                     $image->crop($_POST['w'], $_POST['h'], $_POST['x1'], $_POST['y1']);
                 } else {
                     $image->crop(400, 200, 0, 0);
                 }
                 $image->resize(400, 200, EasyImage::RESIZE_WIDTH);
                 $image->save($thumbDir . '/medium-' . $thumbName);
             }
             // create medium thumb
             if (isset($param['large'])) {
                 $image = new EasyImage($img);
                 if (!empty($_POST['w'])) {
                     $image->crop($_POST['w'], $_POST['h'], $_POST['x1'], $_POST['y1']);
                 } else {
                     $image->crop(650, 400, 0, 0);
                 }
                 $image->resize(650, 400, EasyImage::RESIZE_WIDTH);
                 $image->save($thumbDir . '/large-' . $thumbName);
             }
         }
     }
 }