PHP Date Function

Hello Guys,Can any one help me it's quite easy I think but I am not getting it.I want condition on this code.

<?php
//define the year
$thisYear = date('Y');
$filtered = array_map("strip", $_POST);

function strip($val){
$val = strip_tags($val);
$val = htmlentities($val,ENT_QUOTES);
return $val;
}

function renderDropDown($name, $opts, $valueIsKey=true){
$out = array();
$out[] = '<select name="'.$name.'">';
foreach($opts as $key => $val){
    if($valueIsKey){
        $out[] = '<option value="'.$key.'">'.$val.'</option>';
    } else {
        $out[] = '<option value="'.$val.'">'.$val.'</option>';
    }
}
$out[] = '</select>';

return implode("\n", $out);
}

if($_POST['submit'] != 'submit' && !isset($_POST['submit'])){
//define text months
for($i=2; $i<=13; $i++){
    $calTime = mktime(0, 0, 0, $i, 0, $thisYear);
    $months[date('m', $calTime)] = date('M', $calTime);
}
$renderHTML = true;
} else {    
    //try to construct a valid date from post data
if(checkdate($filtered['months'], $filtered['days'], $filtered['years'])){
    //valid date..check if they are 18+
    $validAge = $thisYear - 18;
    if($filtered['years'] <= $validAge){
        //inside you go
        die('Location: http://www.ask.com');
    } else {
        header('Location: http://www.google.com');
    }
} else {
    //invalid date.. try again mr hacker
}
}

if($renderHTML){
?>
<form name="ageVerifier" action="" method="post">
    Day: <?php print(renderDropDown('days', range(1,31), false)); ?>
    Month: <?php print(renderDropDown('months', $months)); ?>
    Year: <?php print(renderDropDown('years', range($thisYear, $thisYear-100), false)); ?>
    <input type="submit" name="submit" value="submit" />
</form>
<?php
}
?>

PHP:

I have the code but it's not working correctly.If age is under 18 then it redirecting is great but if age is minimum 18 then I want to redirect to another page.Can any one please help me.

Thanks in Advance.

 

http://snippets.dzone.com/posts/show/1310

 

I see this code "die('Location: http://www.ask.com');" this seems wrong ;p

it should be header('Location: http://www.ask.com'); right?

Regards.