//原始图像        $dst = "/upload/20120914/20120914040740-0.jpg"; //注意图片路径要正确        //得到原始图片信息        $dst_info = getimagesize($dst);         switch ($dst_info[2])        {         case 1:         $dst_im =imagecreatefromgif($dst);break;         case 2:         $dst_im =imagecreatefromjpeg($dst);break;         case 3:         $dst_im =imagecreatefrompng($dst);break;         case 6:         $dst_im =imagecreatefromwbmp($dst);break;         default:         die("不支持的文件类型1");exit;        }        //水印图像        $src = "/images/shuiyin.png"; //注意路径要写对        $src_info = getimagesize($src);        switch ($src_info[2])        {         case 1:         $src_im =imagecreatefromgif($src);break;         case 2:         $src_im =imagecreatefromjpeg($src);break;         case 3:         $src_im =imagecreatefrompng($src);break;         case 6:         $src_im =imagecreatefromwbmp($src);break;         default:         die("不支持的文件类型1");exit;        }        //半透明格式水印        //$alpha = 50;//水印透明度        //imagecopymerge($dst_im,$src_im,$dst_info[0]-$src_info[0]-10,$dst_info[1]-$src_info[1]-10,0,0,$src_info[0],$src_info[1],$alpha);        //支持png本身透明度的方式        imagecopy($dst_im,$src_im,$dst_info[0]-$src_info[0]-10,$dst_info[1]-$src_info[1]-10,0,0,$src_info[0],$src_info[1]);        //保存图片        switch ($dst_info[2]){         case 1:         imagegif($dst_im,$dst);break;         case 2:         imagejpeg($dst_im,$dst);break;         case 3:         imagepng($dst_im,$dst);break;         case 6:         imagewbmp($dst_im,$dst);break;         default:         die("不支持的文件类型2");exit;        }        imagedestroy($dst_im);        imagedestroy($src_im);