PHP利用ueditor实现上传图片添加水印

    private function imageWaterMark($groundImage,$waterPos=0,$waterImage="",$waterText="",$textFont=5,$textColor="#FF0000")
    {
        $isWaterImage = FALSE;
        $fORMatMsg = "暂不支持该文件格式，请用图片处理软件将图片转换为GIF、JPG、PNG格式。";
        //读取水印文件
        if(!empty($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($formatMsg);
            }
        }
        else
        {
            die("需要加水印的图片不存在！");
        }
        //水印位置
        if($isWaterImage)//图片水印
        {
            $w = $water_w;
            $h = $water_h;
            $label = "图片的";
        }
        else//文字水印
        {
            $temp = imagettfbbox(ceil($textFont*5),0,"./cour.ttf",$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 - 10;   // -10 是距离右侧10px 可以自己调节
                $posY = $ground_h - $h - 10;   // -10 是距离底部10px 可以自己调节
                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 
        }
        else//文字水印
        {
            if( !emptyempty($textColor) && (strlen($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);
    }