function hextoten($int)
{
    $tabelka=array(
                   '0'=>0,
                   '1'=>1,
                   '2'=>2,
                   '3'=>3,
                   '4'=>4,
                   '5'=>5,
                   '6'=>6,
                   '7'=>7,
                   '8'=>8,
                   '9'=>9,
                   'A'=>10,
                   'B'=>11,
                   'C'=>12,
                   'D'=>13,
                   'E'=>14,
                   'F'=>15
                   );
    for($i=strlen($int)-1;$i>-1;--$i)
    {
        $wyn=$wyn+str_replace($int[strlen($int)-$i-1], $tabelka[$int[strlen($int)-$i-1]]*pow(16, $i), $int[strlen($int)-$i-1]);
    }
return (trim($wyn))?$wyn:0;
}