PHP求周岁

function getAge($birthday) {
$age = 0;
$year = $month = $day = 0;
if (is_array($birthday)) {
extract($birthday);
} else {
if (strpos($birthday, '-') !== false) {
list($year, $month, $day) = explode('-', $birthday);
$day = substr($day, 0, 2);
}
}
$age = date('Y') - $year;
if (date('m') < $month || (date('m') == $month && date('d') < $day)) $age--;
return $age;
}

/**
* 计算年龄
* @param $args
* @return number:返回当前年龄
*/
private function getAge($birthyear,$birthday){
$year = date("Y");
$date = date('md');
$add_age = $birthday < $date ? 0 : -1;
$age = $year - $birthyear + $add_age;
if($age < 18){
$age = 18;
}
return $age;
}