PHP编程：为百度UE编辑器上传图片添加水印功能

//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]));
}

/* 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;