PHP programming kindeditor uploads pictures and adds watermarks

This article mainly introduces the implementation of adding watermarks to pictures uploaded by kindeditor in PHP programming. It has a certain reference value. Now I share it with you. Friends in need can refer to it.

Regarding how to add watermarks to pictures Watermarking is a problem encountered by many technicians. Everyone has seen that WeChat official accounts and some other technical platforms can implement this function, but they have no clue how to implement it in the source code. So today I will introduce it to you. Regarding the method of adding watermarks to images uploaded to kindeditor, I believe all technical staff will know after reading this.

Step one: Modify the upload_json.php file
in the editor’s / This file can be found in the php/ directory, and a new function is added:

/*
    * 功能：PHP图片水印，水印支持图片或文字
    * 参数：
    * $groundImage 背景图片，即需要加水印的图片，暂只支持GIF,JPG,PNG格式；
    * $waterPos 水印位置，有10种状态，0为随机位置；
    *   1为顶端居左，2为顶端居中，3为顶端居右；
    *   4为中部居左，5为中部居中，6为中部居右；
    *   7为底端居左，8为底端居中，9为底端居右；
    * $waterImage 图片水印，即作为水印的图片，暂只支持GIF,JPG,PNG格式；
    * $alpha 水印透明度，取值1-100；
    * $waterText 文字水印，即把文字作为为水印，支持ASCII码，不支持中文；
    * $textFont 文字大小，值为1、2、3、4或5，默认为5；
    * $textColor 文字颜色，值为十六进制颜色值，默认为#FF0000(红色)；
    *
    * $waterImage 和 $waterText 最好不要同时使用，选其中之一即可，优先使用 $waterImage。
    * 当$waterImage有效时，参数$waterString、$stringFont、$stringColor均不生效。
    * 加水印后的图片的文件名和 $groundImage 一样。
*/
function imageWaterMark($groundImage, $waterPos=0, $waterImage='', $alpha=80, $waterText='', $water_fontfile, $textFont=9, $textColor='#FF0000'){
    $isWaterImage = FALSE;
    $formatMsg = '不支持该图片格式！请使用GIF、JPG、PNG格式的图片。';
    $fontFile = $water_fontfile;
    //读取水印文件
    if(!empty($waterImage) && file_exists($waterImage)){
        $isWaterImage = TRUE;
        $water_info = getimagesize($waterImage);
        $water_w = $water_info[0];//取得水印图片的宽
        $water_h = $water_info[1];//取得水印图片的高
        switch($water_info[2]){//取得水印图片的格式
            case 1:$water_im = imagecreatefromgif($waterImage);break;
            case 2:$water_im = imagecreatefromjpeg($waterImage);break;
            case 3:$water_im = imagecreatefrompng($waterImage);break;
            default:die($formatMsg);
        }
    }
    //读取背景图片
    if(!empty($groundImage) && file_exists($groundImage)){
        $ground_info = getimagesize($groundImage);
        $ground_w = $ground_info[0];//取得背景图片的宽
        $ground_h = $ground_info[1];//取得背景图片的高
        switch($ground_info[2]){//取得背景图片的格式
            case 1:$ground_im = imagecreatefromgif($groundImage);break;
            case 2:$ground_im = imagecreatefromjpeg($groundImage);break;
            case 3:$ground_im = imagecreatefrompng($groundImage);break;
            default:die($formatMsg);
        }
    }else{
        alert("水印图片不存在！");
    }
    //水印位置
    if($isWaterImage){//图片水印
        $w = $water_w;
        $h = $water_h;
        $label = "图片的";
    }else{//文字水印
        $temp = imagettfbbox($textFont, 0, $fontFile, $waterText);//取得使用 TrueType 字体的文本的范围
        $w = $temp[2] - $temp[6];
        $h = $temp[3] - $temp[7];
        unset($temp);
        $label = "文字区域";
    }
    if(($ground_w<$w) || ($ground_h<$h)){
        echo "需要加水印的图片的长度或宽度比水印".$label."还小，无法生成水印！";
        return;
    }
    switch($waterPos){
        case 0://随机
        $posX = rand(0,($ground_w - $w));
        $posY = rand(0,($ground_h - $h));
        break;
        case 1://1为顶端居左
        $posX = 0;
        $posY = 0;
        break;
        case 2://2为顶端居中
        $posX = ($ground_w - $w) / 2;
        $posY = 0;
        break;
        case 3://3为顶端居右
        $posX = $ground_w - $w;
        $posY = 0;
        break;
        case 4://4为中部居左
        $posX = 0;
        $posY = ($ground_h - $h) / 2;
        break;
        case 5://5为中部居中
        $posX = ($ground_w - $w) / 2;
        $posY = ($ground_h - $h) / 2;
        break;
        case 6://6为中部居右
        $posX = $ground_w - $w;
        $posY = ($ground_h - $h) / 2;
        break;
        case 7://7为底端居左
        $posX = 0;
        $posY = $ground_h - $h;
        break;
        case 8://8为底端居中
        $posX = ($ground_w - $w) / 2;
        $posY = $ground_h - $h;
        break;
        case 9://9为底端居右
        $posX = $ground_w - $w;
        $posY = $ground_h - $h;
        if(!$isWaterImage){
        $posY = $ground_h - $h-20;
        }
        break;
        default://随机
        $posX = rand(0,($ground_w - $w));
        $posY = rand(0,($ground_h - $h));
        break;
    }
    //设定图像的混色模式
    imagealphablending($ground_im, true);
    if($isWaterImage){//图片水印
        //imagecopy($ground_im, $water_im, $posX, $posY, 0, 0, $water_w,$water_h);//拷贝水印到目标文件
        //生成混合图像
        imagecopymerge($ground_im, $water_im, $posX, $posY, 0, 0, $water_w, $water_h, $alpha);
    } else {//文字水印
        if( !empty($textColor) && (strlen($textColor)==7)){
            $R = hexdec(substr($textColor,1,2));
            $G = hexdec(substr($textColor,3,2));
            $B = hexdec(substr($textColor,5));
        } else {
            die("水印文字颜色格式不正确！");
        }
        imagestring($ground_im, $textFont, $posX, $posY, $waterText, imagecolorallocate($ground_im, $R, $G, $B));
    }
    //生成水印后的图片
    @unlink($groundImage);
    switch($ground_info[2]){//取得背景图片的格式
        case 1:imagegif($ground_im,$groundImage);break;
        case 2:imagejpeg($ground_im,$groundImage);break;
        case 3:imagepng($ground_im,$groundImage);break;
        default:die($errorMsg);
    }
    //释放内存
    if(isset($water_info)) unset($water_info);
    if(isset($water_im)) imagedestroy($water_im);
    unset($ground_info);
    imagedestroy($ground_im);
}

Step 2: Find$json = new Services_JSON( ); Note that there are two places, not the one in the alert function. Add the following code:

  /* 水印配置开始 */
    $water_mark = 1;//1为加水印, 其它为不加
    $water_pos = 9;//水印位置，10种状态【0为随机，1为顶端居左，2为顶端居中，3为顶端居右；4为中部居左，5为中部居中，6为中部居右；7为底端居左，8为底端居中，9为底端居】
    $water_img = $_SERVER['DOCUMENT_ROOT'].'/upfiles/water.gif';//水印图片,默认填写空,请将图片上传至网站根目录的upfiles下,例: water.gif
    $water_alpha = 50;//水印透明度
    $water_text = '';//水印字符串,默认填写空;
    //$water_fontfile = $_SERVER['DOCUMENT_ROOT'] .'/upfiles/fonts/arial.ttf';//文字水印使用的字体;
    if($water_mark == 1){
        imageWaterMark($file_path, $water_pos, $water_img, $water_alpha, $water_text, $water_fontfile);
    }
    /* 水印配置结束 */

The above is the implementation of the code, then this method is mainly suitable for In PHP programming, you can learn about other languages. If you still don’t understand anything, you can leave a message below for discussion.

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