Calculate age using date of birth

calculate_age.php

<?php
function age($date){
	$year_diff = '';
	$time = strtotime($date);
	if(FALSE === $time){
		return '';
	}

	$date = date('Y-m-d', $time);
	list($year,$month,$day) = explode("-",$date);
	$year_diff = date("Y") – $year;
	$month_diff = date("m") – $month;
	$day_diff = date("d") – $day;
	if ($day_diff < 0 || $month_diff < 0) $year_diff–;

	return $year_diff;
}
?>

Calculate age using date of birth

Pass a birth date to this function, and it will return the age of the person; very useful when building communities or social media sites.