UEditor编辑器没有上传图片加水印的功能，需要进行二次开发，本例是在PHPCMS系统中对百度编辑器进行二次开发，添加上传图片加水印功能。

首先打开UEditor编辑器文件目录的php文件夹，打开Uploader.class.php，把PHPCMS添加水印的方法复制过来，加到这个类所有成员方法最后面，然后进行修改如下：

//图片加水印
 public function watermark($source, $target = '', $w_pos = '', $w_img = '', $w_text = '99danji',$w_font = 8, $w_color = '#ff0000') {
   $this->w_img = 'watermark.png'; 
  $this->w_pos = 9; 
  $this->w_minwidth = 400;
   $this->w_minheight = 200;
   $this->w_quality = 80;
   $this->w_pct = 85;
      $w_pos = $w_pos ? $w_pos : $this->w_pos;
   $w_img = $w_img ? $w_img : $this->w_img;
   //if(!$this->watermark_enable || !$this->check($source)) return false;
   if(!$target) $target = $source;
   //$w_img = PHPCMS_PATH.$w_img; 
  //define('WWW_PATH', dirname(dirname(dirname(__FILE__)));
   $w_img = '../../../images/water/'.$w_img;
   $source_info = getimagesize($source);
   $source_w  = $source_info[0];
   $source_h  = $source_info[1]; 
  //if($source_w < $this->w_minwidth || $source_h < $this->w_minheight) return false; 
  switch($source_info[2]) { 
    case 1 : 
      $source_img = imagecreatefromgif($source);
       break;
     case 2 :  
     $source_img = imagecreatefromjpeg($source); 
      break; 
    case 3 :  
     $source_img = imagecreatefrompng($source); 
      break;
     default : 
      return false; 
  } 
  if(!empty($w_img) && file_exists($w_img)) {
     $ifwaterimage = 1; 
    $water_info  = getimagesize($w_img); 
    $width    = $water_info[0];
     $height    = $water_info[1]; 
    switch($water_info[2]) {
       case 1 : 
        $water_img = imagecreatefromgif($w_img); 
        break; 
      case 2 :  
       $water_img = imagecreatefromjpeg($w_img); 
        break; 
      case 3 : 
        $water_img = imagecreatefrompng($w_img); 
        break; 
      default :   
      return;  
   } 
  } else {  
       $ifwaterimage = 0; 
    $temp = imagettfbbox(ceil($w_font*2.5), 0, PC_PATH.'libs/data/font/elephant.ttf', $w_text);     $width = $temp[2] - $temp[6]; 
    $height = $temp[3] - $temp[7]; 
    unset($temp); 
  } 
  switch($w_pos) { 
    case 1:  
     $wx = 5;  
     $wy = 5;  
    break;   
  case 2:     
  $wx = ($source_w - $width) / 2;  
     $wy = 0;  
     break; 
    case 3: 
      $wx = $source_w - $width; 
      $wy = 0; 
      break;  
   case 4: 
      $wx = 0;  
     $wy = ($source_h - $height) / 2;  
     break; 
    case 5: 
      $wx = ($source_w - $width) / 2;
       $wy = ($source_h - $height) / 2; 
      break; 
    case 6: 
      $wx = $source_w - $width; 
   $wy = ($source_h - $height) / 2;  
     break;     case 7:  
     $wx = 0;  
     $wy = $source_h - $height; 
      break; 
    case 8: 
      $wx = ($source_w - $width) / 2; 
      $wy = $source_h - $height; 
      break; 
    case 9: 
      $wx = $source_w - $width; 
      $wy = $source_h - $height;  
     break;   
  case 10:     
  $wx = rand(0,($source_w - $width));  
     $wy = rand(0,($source_h - $height));  
     break;       
     default:  
     $wx = rand(0,($source_w - $width)); 
      $wy = rand(0,($source_h - $height));    
   break; 
  }   
if($ifwaterimage) { 
    if($water_info[2] == 3) {   
    imagecopy($source_img, $water_img, $wx, $wy, 0, 0, $width, $height); 
    } else {   
    imagecopymerge($source_img, $water_img, $wx, $wy, 0, 0, $width, $height, $this->w_pct); 
    } 
  } else {   
  if(!empty($w_color) && (strlen($w_color)==7)) { 
      $r = hexdec(substr($w_color,1,2)); 
      $g = hexdec(substr($w_color,3,2)); 
      $b = hexdec(substr($w_color,5)); 
    } else {  
     return;  
   } 
    imagestring($source_img,$w_font,$wx,$wy,$w_text,imagecolorallocate($source_img,$r,$g,$b));
   } 
      switch($source_info[2]) { 
    case 1 :    
   imagegif($source_img, $target);  
     break;  
   case 2 :  
     imagejpeg($source_img, $target, $this->w_quality); 
      break; 
    case 3 :  
     imagepng($source_img, $target); 
      break; 
    default : 
      return; 
  }  
    if(isset($water_info)) { 
    unset($water_info);
   } 
  if(isset($water_img)) { 
    imagedestroy($water_img);  
 } 
  unset($source_info); 
  imagedestroy($source_img); 
  return true; }
    public function check($image) {  
 return extension_loaded('gd') && preg_match("/\.(jpg|jpeg|gif|png)/i", $image, $m) && file_exists($image) && function_exists('imagecreatefrom'.($m[1] == 'jpg' ? 'jpeg' : $m[1])); }

对比我修改的部分，由于phpcms水印可以在后台管理设置，phpcms自带的水印方法通过读取配置文件获取路径，和读取数据库设置获取参数设置，那么这些地方需要手动进行设置。

对了，在upFile方法还要添加一段函数：

if ($this->watermark) {
    $this->watermark($this->filePath,$this->filePath);
}

然后打开UEditor百度编辑器php目录下的action_upload.php文件，加上是否添加水印的参数：

/* 上传配置 */
$base64 = "upload"; switch (htmlspecialchars($_GET['action'])) {   case 'uploadimage': 
    $config = array(
       "pathFormat" => $CONFIG['imagePathFormat'], 
      "maxSize" => $CONFIG['imageMaxSize'], 
      "allowFiles" => $CONFIG['imageAllowFiles'] 
    );  
   $fieldName = $CONFIG['imageFieldName']; 
    $watermark = true; 
    break; 

然后在后面还有一句要改成：

/* 生成上传实例对象并完成上传 */
$up = new Uploader($fieldName, $config, $base64, $watermark);