ueditor 图片加水印

<?php

/*PHP图片加文字水印类库

  
  该类库暂时只支持文字水印，位置为右下角，颜色随机
  
 调用方法：
   1、在需要加水印的文件顶部引入类库：
      include_once 'imageClass.php';
   2、声明新类：
    $tpl=new image_fu;
   3、给图片水印提供参数：
      $tpl->img(图片路径,水印文字,字体路径,字体大小,字体角度);
    比如：$tpl->img('abc.jpg','这是水印文字','ziti.ttf',30,0)
    
*/

 class image_fu{
   
   private $image;
   private $img_info;
   private $img_width;
   private $img_height;
   private $img_im;
   private $img_text;
   private $img_ttf='';
   private $img_new;
   private $img_text_size;
   private $img_jd;
   
   
   function img($img='',$txt='',$ttf='',$size=12,$jiaodu=0){
    if(isset($img)&&file_exists($img)){//检测图片是否存在
       $this->image   =$img; 
       $this->img_text=$txt;
       $this->img_text_size=$size;
       $this->img_jd=$jiaodu;
      if(file_exists($ttf)){
       $this->img_ttf=$ttf;
      }else{
       exit('字体文件：'.$ttf.'不存在！'); 
      }
       $this->imgyesno();
    }else{
        exit('图片文件:'.$img.'不存在');
     } 
   }
  
   private function imgyesno(){
    
    $this->img_info  =getimagesize($this->image);
    $this->img_width =$this->img_info[0];//图片宽
    $this->img_height=$this->img_info[1];//图片高
    
    //检测图片类型
    switch($this->img_info[2]){
             case 1:$this->img_im = imagecreatefromgif($this->image);break; 
             case 2:$this->img_im = imagecreatefromjpeg($this->image);break; 
             case 3:$this->img_im = imagecreatefrompng($this->image);break; 
             default:exit('图片格式不支持水印'); 
    }
    
       $this->img_text();
   }
   
   
   private function img_text(){
     
     imagealphablending($this->img_im,true);
     
     //设定颜色
      $color=imagecolorallocate($this->img_im,255,255,255);
      $txt_height=$this->img_text_size;
      $txt_jiaodu=$this->img_jd;
      $ttf_im=imagettfbbox($txt_height,$txt_jiaodu,$this->img_ttf,$this->img_text);
      $w = $ttf_im[2] - $ttf_im[6]; 
          $h = $ttf_im[3] - $ttf_im[7]; 
      //$w = $ttf_im[7]; 
          //$h = $ttf_im[8]; 

          unset($ttf_im);
      
      $txt_y     =$this->img_height*0.5;
      $txt_x     =$this->img_width*0.2;
      //$txt_y     =0;
      //$txt_x     =0;

      
      
      $this->img_new=@imagettftext($this->img_im,$txt_height,$txt_jiaodu,$txt_x,$txt_y,$color,$this->img_ttf,$this->img_text);
     
     @unlink($this->image);//删除图片
    switch($this->img_info[2]) {//取得背景图片的格式 
          case 1:imagegif($this->img_im,$this->image);break; 
          case 2:imagejpeg($this->img_im,$this->image);break; 
          case 3:imagepng($this->img_im,$this->image);break; 
          default: exit('水印图片失败'); 
        } 

   }
   
   
   //显示图片
   function img_show(){echo '<img src="'.$this->image.'" border="0" alt="'.$this->img_text.'" />';}
   
   //释放内存
   private function img_nothing(){
     unset($this->img_info); 
         imagedestroy($this->img_im); 
   }
   
 }
 
?>