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PHP: calculate age from a date of birth, without a database

Difficulty

Displaying age based on a date of birth is a common requirement on websites, whether for user profiles, birthdays, or other use cases.

This tutorial shows you how to do it easily in PHP, without needing a database, using a reusable function. Ready to learn how?

Place this first block of code right after the <body> tag:

<?php function Age($birth_date) {
    $arr1 = explode('-', $birth_date);
    $arr2 = explode('-', date('Y-m-d'));
    if(($arr1[1] < $arr2[1]) || (($arr1[1] == $arr2[1]) && ($arr1[2] <= $arr2[2])))
    return $arr2[0] - $arr1[0];
    return $arr2[0] - $arr1[0] - 1;
}
?>

Place this second block of code where you want the age to be displayed:

<?php $my_birthday = '1992-07-19';
$my_age = Age($my_birthday);
echo $my_age;
?>

For this example, the date of birth is 1992-07-19 (no, it’s not mine 😉). Here is the result: 33.

If you want to display multiple ages on the same page, simply paste the second block of code multiple times and change the date of birth.