/** * @uses 根据生日计算年龄，生日的格式是：2016-09-23 * @param string $birthday * @return string|number */function calcAge($birthday){    $iage = 0;    if (!empty($birthday)) {        $year = date('Y', strtotime($birthday));        $month = date('m', strtotime($birthday));        $day = date('d', strtotime($birthday));        $now_year = date('Y');        $now_month = date('m');        $now_day = date('d');        if ($now_year > $year) {            $iage = $now_year - $year - 1;            if ($now_month > $month) {                $iage++;            } else if ($now_month == $month) {                if ($now_day >= $day) {                    $iage++;                }            }        }    }    return $iage;}