Checking age

[Anon]

Hi im building a member service where the members should be at least 18 years old. Can any1 help me with the easiest way to check their age. I have the age input from a form with dropdowns for day - month - year.

Thanks in advance

Tom

[saltwater]

suppose your dropdowns are called b_day,b_month and b_year, this code should do the job, i didn't tested or debug the function so there could be an error in it :o)
but I think it will work
<?
if (checkage($b_day,$b_month,$b_year)) {//user is above 18}
else {//user is below 18}

function checkage($b_day,$b_month,$b_year) {
//i asume your year format is 4 digits
if ($b_year<date("Y")-18) {
if ($b_month<date("n")) {
if ($b_day<date("j")) {
$return=true;
}
else $return=false;
}
else {$return=false;}
}
else {$return=false;}
return $return;
}
?>

[kparker]

That doesn't actually work. The following is kind of brute-force,
but it does work:

<?php
function checkage($b_day,$b_month,$b_year)
{
//i asume your year format is 4 digits

if ($b_year < date("Y")-18)
&nbsp;&nbsp;$return = false;
else if ( $b_year < date("Y")-18 && ($b_month < date("n")
&nbsp;&nbsp;|| ($b_month == date("n") && $b_day < date("j"))))

&nbsp;&nbsp;$return=true;
else
&nbsp;&nbsp;$return=false;

if ($return)
&nbsp;&nbsp;echo "OK\r\n";
else
&nbsp;&nbsp;echo "Underage\r\n";
}

checkage( 15, 8, 1983 );
checkage( 16, 8, 1983 );
checkage( 17, 8, 1983 );

?>