PHP实例:实现给上传图片加水印图案

     $iinfo=getimagesize($destination,$iinfo); 
        $nimage=imagecreatetruecolor($image_size[0],$image_size); 
        $white=imagecolorallocate($nimage,255,255,255); 
        $black=imagecolorallocate($nimage,0,0,0); 
        $red=imagecolorallocate($nimage,255,0,0); 
        imagefill($nimage,0,0,$white); 
        switch ($iinfo) 
        { 
            case 1: 
            $simage =imagecreatefromgif($destination); 
            break; 
            case 2: 
            $simage =imagecreatefromjpeg($destination); 
            break; 
            case 3: 
            $simage =imagecreatefrompng($destination); 
            break; 
            case 6: 
            $simage =imagecreatefromwbmp($destination); 
            break; 
            default: 
            die("不支持的文件类型"); 
            exit; 
        } 
        imagecopy($nimage,$simage,0,0,0,0,$image_size[0],$image_size); 
        imagefilledrectangle($nimage,1,$image_size-15,80,$image_size,$white); 
        switch($watertype) 
        { 
            case 1:   //加水印字符串 
            imagestring($nimage,2,3,$image_size-15,$waterstring,$black); 
            break; 
          &nbs