why isn't this unsetting?

[sabret00the]

PHP Code:

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

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


Array
(
    [0] => admining
    [1] => amazon
    [2] => another tag
    [3] => ebs
    [4] => ex-girlfriend
    [5] => life
    [6] => meme
    [7] => music
    [8] => retest
    [9] => singledom
    [10] => test
    [11] => test again
    [12] => wishlist
    [13] => work
)

retestretest

Array
(
    [0] => admining
    [1] => amazon
    [2] => another tag
    [3] => ebs
    [4] => ex-girlfriend
    [5] => life
    [6] => meme
    [7] => music
    [8] => retest
    [9] => singledom
    [10] => test
    [11] => test again
    [12] => wishlist
    [13] => work
)

i even tried

PHP Code:

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

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