age detection problem if birthday is February 29

[ainars]

I use the script below to detect age so that user can not register if he/she is under 18. it works, but there is one problem - if user selects February 29 as birthdate he gets "You are too young" even if year is 1920....

Any ideas?

$birthdate = "$year-$month-$day";
$age = calc_age($birthdate);

if ($age < 18) {

die("You are too young");
}

function calc_age($birthdate){

$date_elements = explode("-" ,$birthdate);
if (!checkdate($date_elements[1],$date_elements[2],$date_elements[0])) return "";
$iMonth = $date_elements[1];
$iDay = $date_elements[2];
$iYear = $date_elements[0];
If ($iYear < 100) $iYear = 1900 + $iYear; 
$baseyear = date("Y") - $iYear - 1; 
If ($iMonth < date("m") OR ($iMonth == date("m") AND $iDay <= date("d"))) $baseyear++; 
return $baseyear; 
}
else{
return "";
}

[LordShryku]

Works for me, though I'd suspect you're probably dying on the checkdate. Try returning an actual error message and just echoing $age to see what it's returning.

[devinemke]

your code suggests that the birthdate data is coming via 3 separate integers: $year, $month, $day. if so here is a simpiler approach:

$birthdate = strtotime("$year-$month-$day");
$minus_18 = strtotime('18 years ago');
if ($birthdate <= $minus_18) {echo 'you are over 18';}
else {echo 'you are under 18';}

[ainars]

thank you. i will try.