How to check age in php?

Question

PHP

For example, a user fills out a form in the format dd.mm.yyyy (04/30/1993), we need to check if he is 18 years old.
Are there effective methods?

PS I don't really want to get the current day, month, year and compare it with the day, month and year from the user.
Perhaps there are easier solutions?

Also, I tried to compare in UNIX, but there are difficulties with the number of days in a year, which must be taken into account in the calculations.

Answer 1

<?php
$birthDate = '20.02.2010';
if (time() < strtotime('+18 years', strtotime($birthDate))) {
    echo 'меньше 18';
} else {
    echo 'больше 18';
}