非常实用的php验证码类

<"Content-type: image/gif"); 
      imagegif($this->img_resouce); 
    }else if(imagetypes() & IMG_JPEG) { 
      header("Content-type: image/jpeg"); 
      imagejpeg($this->img_resouce); 
    }else if(imagetypes() & IMG_PNG) { 
      header("Content-type: image/png"); 
      imagepng($this->img_resouce); 
    }else { 
      echo "PHP不支持的类型"; 
    } 
     
     
  } 
  private function __destruct(){ 
     
    imagedestroy($this->img_resouce); 
  } 
} 
?>