<?php
// Function to calculate whether customer is old enough to purchase product – DOB input in format YYYY-MM-DD
// Created by Jacob Ward (http://www.jacobward.co.uk) - Please leave this in if you choose to use this in your projects.
function validate_age($dob, $restriction) {
$dates = explode("-", $dob); // Exploding sections of date into array
$year = date("Y") - $dates["0"]; // Subtracting entered year from current year
$month = date("m") - $dates["1"]; // Subtracting entered month from current month
$day = date("d") - $dates["2"]; // Subtracting entered day from current day
// If month is negative, means it's a year earlier - Decrement year by 1. Else if month is 0 and day is negative, means it's a year earlier - Decrement year by 1
if ($month < 0) {
$year--;
} elseif ($month == 0 && $day < 0) {
$year--;
}
// If customer's age is greater than or equal to certificate then age is valid, else it's invalid
if ($year >= $restriction) {
$valid_age = TRUE;
} else {
$valid_age = FALSE;
}
return $valid_age; // Return TRUE or FALSE whether customer is old enough to purchase product
}
?>
$dob = "1985-11-18";
$age_restriction = 18;
validate_age($dob, $age_restriction);
