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php age calculator

How to Calculate an Age By Birthday Using PHP

This PHP function accepts a birthday as a parameter and will return the age based on that birthday. Handy for social sites/applications.

<?php
// PHP 5.3-
function birthday($birthday){
$age = strtotime($birthday);

if($age === false){
return false;
}

list($y1,$m1,$d1) = explode("-",date("Y-m-d",$age));

$now = strtotime("now");

list($y2,$m2,$d2) = explode("-",date("Y-m-d",$now));

$age = $y2 - $y1;

if((int)($m2.$d2) < (int)($m1.$d1))
$age -= 1;

return $age;
}

echo birthday('1981-05-18');

// PHP 5.3+
function birthday($birthday) {
$age = date_create($birthday)->diff(date_create('today'))->y;

return $age;
}

echo birthday('1981-05-18');

December 8, 2013