PHP图片加文字水印类库

2015/01/17 43477

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<?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,rand(0,255),rand(0,255),rand(0,255));
          $txt_height=$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-$h;
          $txt_x     =$this->img_width-$w;
          //$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);
     }
      
 }
  
?>