How does nginx add watermark to images through PHP proxy (detailed code)

This article brings you relevant knowledge about how nginx adds watermarks to images through PHP agents, as well as related issues about how to call them, through code examples. , let’s take a look at it, I hope it will be helpful to everyone.

(Recommended tutorials: nginx tutorial, PHP video tutorial)

nginx configuration proxy

location ~ /image/.*\.(gif|jpg|jpeg|png)$ {
    proxy_pass http://127.0.0.1:8888/test/watermark?url=$request_uri;
}

/img/ matches the directory prefix to be proxied, and the $request_uri parameter is the image path to be accessed.

php watermark class

/** 水印类
 * Class Watermark
 * @package app\test
 */
class Watermark
{
    /** 合成图片水印
     * @param string $dstImage 原图片
     * @param string $waterImg 水印图
     */
    public static function imageMarking($dstImage, $waterImg){
        //获取图片信息
        $dstInfo = getimagesize($dstImage);
        $waterInfo = getimagesize($waterImg);
        //创建图像
        $dstImgObj = self::imageCreateFrom($dstImage, $dstInfo[2]);
        $waterImgObj = self::imageCreateFrom($waterImg, $waterInfo[2]);
        //合成水印
        imagecopyresized($dstImgObj,$waterImgObj,0, 0,0,0,$dstInfo[0], $dstInfo[1],$waterInfo[0],$waterInfo[1]);
        //输出图片
        self::imageOut($dstImgObj,$waterInfo[2]);
        //销毁资源对象
        imagedestroy($dstImgObj);
        imagedestroy($waterImgObj);
    }
    /** 生成图片对象
     * @param string $imgFile 图片路径
     * @param string $type 图片类型
     * @return false|\GdImage|resource
     */
    private static function imageCreateFrom($imgFile, $type) {
        switch ($type) {
            case IMAGETYPE_GIF:
                return imagecreatefromgif($imgFile);
            case IMAGETYPE_JPEG:
                return imagecreatefromjpeg($imgFile);
            case IMAGETYPE_PNG:
                return imagecreatefrompng($imgFile);
            default :   //其他格式
        }
    }
    /** 输出图片
     * @param string $imageObj
     * @param string $type
     */
    private static function imageOut($imageObj,$type){
        switch ($type) {
            case 1:
                header("Content-Type: image/gif");
                imagegif($imageObj);
                break;
            case 2:
                header("Content-Type: image/jpeg");
                imagejpeg($imageObj);
                break;
            case 3:
                header("Content-Type: image/png");
                imagepng($imageObj);
                break;
            default: //其他格式
        }
    }
}

Call example

public function watermark(){
    //图片路径前缀
    $image = '/data/img/' . input('url');
    self::imageMarking($image,'watermark.png');
    exit;
}

nginx If you are good at it, you can try to use the http_image_filter_module module to add watermarks , This is also a helpless move for me

(Recommended tutorials: nginx tutorial, PHP video tutorial)

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