php imagick extends two methods of compositing images_PHP tutorial

php imagick extends two methods of compositing images

Method 1: compositeimages

/**
     *  function: 合成图片
     * @param  string      $output_url 图片保存路径
     * @param  string      $img_type   图片保存类型
     * @param  integral    $line_num   每行显示图片数量
     * @param  array       $logo_info  每张待合成图片的信息（要求所有尺寸统一）
     * @param  array       $img_list  待合成的图片绝对路径
     * 
     * @return void
     */
    public function generate($output_url, $img_type, $line_num, $logo_info, $img_list=array()) {

        //计算图片有多少行
        $lines = ceil(count($img_list)/$line_num);

        $bg_width = ($logo_info['width'] + $logo_info['line_width']) * $line_num;
        $bg_height = ($logo_info['height'] + $logo_info['line_height']) * $lines;

        //构建画布
        $canvas = new Imagick();
        $canvas->newimage($bg_width, $bg_height, 'white');
        $canvas->setimageformat($img_type);
        $i = $j = 0;
        foreach ($img_list as $item) {
            $im = new Imagick($item);
            $x = $logo_info['line_width']*2 + $i * $logo_info['width'];
            $y = $logo_info['line_height']*2 + $j * $logo_info['height'];
            
            // $canvas->compositeimage($im -> getimage(), Imagick::COMPOSITE_OVER, $x, $y);
            $canvas -> compositeimage($im, $im->getImageCompose(), $x, $y);

            if (($i + 1) % $line_num === 0) {
                $i = 0;
                $j++;
            } else {
                $i++;
            }
            // unset($im);
            $im -> destroy();
        }
        $canvas->writeimage($output_url);

        //销毁对象
        $canvas -> destroy();
    }

Method 2: combineimages

/**
     *  function: 合成图片
     * @param  string      $output_url 图片保存路径
     * @param  string      $img_type   图片保存类型
     * @param  integral    $line_num   每行显示图片数量
     * @param  array       $logo_info  每张待合成图片的信息（要求所有尺寸统一）
     * @param  array       $img_list  待合成的图片绝对路径
     * 
     * @return void
     */
    public function generate($output_url, $img_type, $line_num, $logo_info, $img_list=array()) {

        //计算图片有多少行
        $lines = ceil(count($img_list)/$line_num);

        $bg_width = ($logo_info['width'] + $logo_info['line_width']) * $line_num;
        $bg_height = ($logo_info['height'] + $logo_info['line_height']) * $lines;
        //构建画布
        $canvas = null;
        $canvas = new Imagick();
        $canvas -> newimage($bg_width, $bg_height, 'white');
        $i = $j = 0;
        foreach ($img_list as $item) {
            $im = null;
            $im = new Imagick($item);
            // $canvas -> readImage($item);
            $canvas -> addimage($im);
            $im -> clear();
            $im -> destroy();
        }

        // $canvas -> flattenImages();
        $canvas -> combineImages( Imagick::CHANNEL_ALL ); 
        $canvas -> writeimage($output_url);

        //销毁对象
        $canvas -> clear();
        $canvas -> destroy();
    }

Personally, I think method 2 is more efficient

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