PHP function to calculate age

gistfile1.aw

<?php

	function calculate_age($birthday)
	{
		$today = new DateTime();
		$diff = $today->diff(new DateTime($birthday));

		if ($diff->y)
		{
			return ($diff->y == 1) ? $diff->y . ' year' : $diff->y . ' years';
		}
		elseif ($diff->m)
		{
			return ($diff->m == 1) ? $diff->m . ' month' : $diff->m . ' months';
		}
		else
		{
			return ($diff->d == 1) ? $diff->d . ' day' : $diff->d . ' days';
		}
	}