Why won't my check age function work?

I created a check age function in PHP to make sure the user is at or over thirteen years old. And I don't understand why it isn't working. Please help.

$varday = users brith day
$varmonth = users brith month
$varyear = users brith year

//check age
if ($showfail == 0 && $bdayerror == "")
{
//add zeros if less than 10
if ($varday < 10){ $varday = "0" . $varday; }
if ($varmonth < 10){ $varmonth = "0" . $varmonth; }
//get current day and append bday
$currentdate = date("U");
$userbday = $varmonth . "//" . $varday . "//" . $varyear;
//calculate bday in unix timestamp
$userage = $currentdate - strtotime($userbday);
//check if at or older than 13
if ($userage < (31556925*13))
{
//set error message variable
$bdayerror = "You are under thirteen years old and therefore are not old enough to access this site!";
$showfail = 1;
}
}

Thanks.

~Imozeb

 

hi,
try to replace this line:

$userbday = $varmonth . "//" . $varday . "//" . $varyear;

Code (markup):

with this line:

$userbday = $varmonth . "/" . $varday . "/" . $varyear;

Code (markup):

 

<?php
	$varday = "12";
	$varmonth = "2";
	$varyear = "1996";
	
	$currentdata = getdate();
	$userbday = $varmonth . "/" . $varday . "/" . $varyear;
	
	$age = $currentdata['year'] - $varyear;
	if ($currentdata['mon'] < $varmonth)
		$age--;

	if ($currentdata['mon'] == $varmonth)
		if ($currentdata['mday'] < $varday)
			$age--;
	
	
	if ($age < 13)
		echo "[$age] You are under thirteen years old and therefore are not old enough to access this site!";
	else
		echo "[$age] old enough";		
?>

PHP: