[amykhar]

I THINK it should be :

echo "<pre>";
        print_r($formdetails['taglist']);
        echo "</pre>";

        foreach ($formdetails['taglist'] AS $k => $v)
        {
            if ($v == $tagtodelete)
            {
                echo $v . $tagtodelete;
                unset($formdetails['taglist'][$k]);
            }
        }
        echo "<pre>";
        print_r($formdetails['taglist']);
        echo "</pre>";
        die;