PHP 年龄计算函数(精确到天)

<?php
/**
* PHP 年龄计算函数
*
* 参数支持数组传参和标准的 Mysql date 类型传参
* params sample
* --------------------------------------------------
$birthArr = array(
year => 2000,
month => 11,
day => 3
);
$birthStr = 2000-11-03;
* --------------------------------------------------
* );
* @author IT不倒翁 <itbudaoweng@gmail.com>
* @copyright (c) 2011,2012 Just Use It!
* @link IT不倒翁 http://yungbo.com
* @param string|array $birthday
* @return number $age
*/
function getAge($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); //get the first two chars in case of 2000-11-03 12:12:00
}
}
$age = date(Y) - $year;
if (date(m) < $month || (date(m) == $month && date(d) < $day)) $age--;
return $age;
}