Calculate age based on birthday

php_age_calculator

// version 1: 
// param: $birth_date (input string: YYYY-MM-DD)
  function birthday ($birth_date){
    list($year,$month,$day) = explode("-",$birth_date);
	$today = date('d-m-Y');

	$a_birthday = explode('-', $birthday);
	$a_today = explode('-', $today);
	$age = $a_today[2] - $year;
	
	if (($a_today[1] < $month) || ($a_today[1] ==$month && $a_today[0] < $day))
	{
		$age--;
	}
	return $age;
  }
  
// version 2
// param $BirthDate -> timestamp

// get age based on birthday 
function ageCalculater($BirthDate){
	$birthday = date("d-m-Y",$BirthDate);	
	$today = date('d-m-Y');

	$a_birthday = explode('-', $birthday);
	$a_today = explode('-', $today);
	$age = $a_today[2] - $a_birthday[2];
	
	if (($a_today[1] < $a_birthday[1]) || ($a_today[1] ==$a_birthday[1] && $a_today[0] < $a_birthday[0]))
	{
		$age--;
	}
	return $age;
}