使用PHPImagick扩展实现图片合成的两种方法

### 方法一：使用 `compositeimages` ```php public function generate($output_url, $img_type, $line_num, $logo_info, $img_list = []) { // 计算图片行数 $lines = ceil(count($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; // 创建画布 $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, $im->getImageCompose(), $x, $y); if (($i + 1) % $line_num === 0) { $i = 0; $j++; } else { $i++; } $im->destroy(); } $canvas->writeimage($output_url); $canvas->destroy(); } ``` ### 方法二：使用 `combineimages` ```php public function generate($output_url, $img_type, $line_num, $logo_info, $img_list = []) { // 计算图片行数 $lines = ceil(count($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; // 创建画布 $canvas = new Imagick(); $canvas->newimage($bg_width, $bg_height, 'white'); $i = $j = 0; foreach ($img_list as $item) { $im = new Imagick($item); $canvas->addimage($im); $im->clear(); $im->destroy(); } $canvas->combineImages(Imagick::CHANNEL_ALL); $canvas->writeimage($output_url); $canvas->clear(); $canvas->destroy(); } ``` ### 总结 在实际应用中，方法二 `combineimages` 通常具有更高的效率，因为它减少了多次调用 `compositeimage` 的开销。然而，具体选择哪种方法还需根据实际需求和性能测试来决定。