Image::merge PHP Method

    private function merge($merge, $x = 0, $y = 0, $opacity = 100)
    {
        imagecopymerge($this->image, $merge->getImage(), $x, $y, 0, 0, $merge->getWidth(), $merge->getHeight(), $opacity);
    }

 function design($images, $border = '', $effect = '', $saveDir = '', $copyLast = false, $output = 'data')
 {
     $id = isset($images[0]['design']) && $images[0]['design'] ? $images[0]['design'] : mt_rand();
     $color = strlen($images[0]['color']) == 7 ? substr($images[0]['color'], 1) : $images[0]['color'];
     $new_image = ($saveDir ? $saveDir : 'cache/') . 'Design-' . $id . '.png';
     $path = '';
     $directories = explode('/', dirname(str_replace('../', '', $new_image)));
     foreach ($directories as $directory) {
         $path = $path . '/' . $directory;
         if (!file_exists(DIR_IMAGE . $path)) {
             @mkdir(DIR_IMAGE . $path, 0777);
         }
     }
     $image = new Image(DIR_IMAGE . $images[0]['src']);
     $width = $images[0]['width'];
     $height = $images[0]['height'];
     $image->resize($width, $height, '', $color);
     if ($images[0]['rotation']) {
         $image->rotate($images[0]['rotation'] * -1);
         $rotate = $images[0]['rotation'];
     }
     // Look for image Mask, to trim stuff outside the target area.
     $imagesrc = substr($images[0]['src'], 0, -4) . '-' . $images[0]['rotation'] . substr($images[0]['src'], -4);
     if (file_exists(DIR_IMAGE . $imagesrc)) {
         $images[0]['width'] = $image->getInfo('width');
         $images[0]['height'] = $image->getInfo('height');
         $images[0]['mask'] = 1;
         $images[0]['src'] = $imagesrc;
         $images[0]['rotation'] = 0;
     }
     if ($copyLast || isset($images[0]['mask'])) {
         // Cover the top of the image with the base image
         $images[0]['left'] = $images[0]['top'] = 0;
         $images[] = $images[0];
     }
     unset($images[0]);
     foreach ($images as $i => $img) {
         $image_temp = new Image(DIR_IMAGE . $img['src']);
         $size = isset($img['size']) && $img['size'] ? $img['size'] / 100 : 1;
         if ($img['type'] != 'text') {
             if (isset($images[$i]['crop']) && strpos($images[$i]['crop'], '/')) {
                 $crop = explode('/', $images[$i]['crop']);
                 $ratio = isset($crop[4]) ? $image_temp->getInfo('width') > $image_temp->getInfo('height') ? $image_temp->getInfo('width') / $crop[4] : $image_temp->getInfo('height') / $crop[4] : 1;
                 $image_temp->crop($crop[0] * $ratio, $crop[1] * $ratio, $crop[2] * $ratio, $crop[3] * $ratio);
             }
             $image_temp->resize($img['width'] * $size, $img['height'] * $size, isset($img['mask']) ? '' : $effect);
             if ($img['rotation']) {
                 $image_temp->rotate($img['rotation'] * -1);
             }
         } else {
             $image_temp->text($img['src'], $img['font'], DESIGN_TEXT_DEFAULT_SIZE * $size, DESIGN_FONT_COLOR, '', $img['rotation'] * -1);
         }
         $imgLeft = isset($img['left']) ? (int) $img['left'] : 0;
         $imgTop = isset($img['top']) ? (int) $img['top'] : 0;
         $opacity = $img['type'] != 'mainProduct' ? 80 : 100;
         $image->merge($image_temp->getResource(), $imgLeft, $imgTop, $opacity);
     }
     /*if ($rotate) {
     		$image->rotate($rotate);
     		$cx = $image->getInfo('width')/2;
     		$cy = $image->getInfo('height')/2;
     		$image->crop($cx - ($width/2),$cy - ($height/2), $cx + ($width/2),$cy + ($height/2));
     		$image->rotate($rotate*-1);*/
     $width = $image->getInfo('width');
     $height = $image->getInfo('height');
     //}
     $image->resize($width, $height, $border, $color);
     if ($output == 'data') {
         return $image->getData(DIR_IMAGE . $new_image);
     } else {
         $image->save(DIR_IMAGE . $new_image);
         if ($this->request->server['HTTPS']) {
             return $this->config->get('config_ssl') . 'image/' . $new_image;
         } else {
             return $this->config->get('config_url') . 'image/' . $new_image;
         }
     }
 }