Miscellaneous
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<?
/***********************************************************************
Name: coppa_check($day, $month, $year)
Author: Jason DeFillippo <jason@mykungfu.com>
Description: This is a down and dirty COPPA age verifier. This function takes 3 args. A birthday, a birthmonth and a birthyear and returns the users actual age if it's good and false if it's non-compliant. Throw this into a general include file and slap it in your library and you won't have to worry if you're letting any kids in. This is an important issue since it's illegal to gather user data if the person is under 13 years old.
***********************************************************************/
function coppa_check($day, $month, $year){
//check to see if we have a 2 digit year. If so convert it to standard 4 char format
if (strlen($year) == 2){$year = "19" . $year;}
//First do a check to see if we have a good date
$isgood = checkdate($month, $day, $year);
//dump it if the date is bad...
if ($isgood != 1){
return FALSE;
}
//do some date to timestamp conversions
$birthdate = mktime(0,0,0,$month,$day,$year);
$today = time();
//now do them back so we can get some different info.
$old_date = getdate($birthdate);
$current_date = getdate($today);
//error check to make sure the date's not in the future
if ($current_date[year] < $year){return FALSE;}
//adjust for day of the month and get final age.
if ($current_date[yday] >= $old_date[yday]){
$age = $current_date[year] - $year;
}else{
$age = ($current_date[year] - $year) -1;
}
//age range check
if ($age < 13 || $age > 120){
return FALSE;
}
//fallthru and spit back the actual age just for fun.
return $age;
}//end coppa_check
?>
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Usage Example
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if ($age = coppa_check(8, 5, 1971)){
echo "$age years old";
}else{
echo "Non-compliant age";
}
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