While looking through stackoverflow I found the following: How to create a dynamic PHP switch statement from MySQL query

Which resulted in me trying something I haven't before, it doesn't work, but I am curious as to why it doesn't work rather than trying to figure out a way to make it work.

Here's my code:

function SOMENAME(){
global $mysqli ;
$out = false ;
$VALIDTOKENS = array();
$sql = "SELECT * FROM `tokens` ORDER BY `tokens`.`id` ASC";
            if($result = mysqli_query($mysqli, $sql)) {
                while ($row = mysqli_fetch_assoc($result)) {
                    $VALIDTOKENS[$row['token']] = $row['token'];
                    }
            }
    if(isset($_GET['key'])) {
    $key = $_GET['key'];    
    }

    switch($key) {
            case $VALIDTOKENS[$key]:
                $out = true ;
            break;
    } 
return $out ;
}

The function always returns false.