<?php
class Tools
{
    //查询某天是星期几
    public static function GetWeekName($date)
    {
        $dayOfWeek = date('N', strtotime($date)); // 获取星期几，1代表星期一，7代表星期日
        $weekname='';
        switch ($dayOfWeek) {
            case 1:
                $weekname= "星期一";
                break;
            case 2:
                $weekname= "星期二";
                break;
            case 3:
                $weekname="星期三";
                break;
            case 4:
                $weekname= "星期四";
                break;
            case 5:
                $weekname= "星期五";
                break;
            case 6:
                $weekname= "星期六";
                break;
            case 7:
                $weekname= "星期日";
                break;
            default:
                $weekname= "无效日期";
        }
        return $weekname;
    }
    //计算年龄，返回年龄 如 31
    public static  function calculateAge($birthdate) {
        $birthdate = new DateTime($birthdate);
        $currentDate = new DateTime();
        $age = $currentDate->diff($birthdate)->y;
        return $age;
    }
    //计算年龄，返回年龄 如 31岁3月3天
    public static function calculateAgeText($birthdate) {
        $birthdate = new DateTime($birthdate);
        $currentDate = new DateTime();
        $ageDiff = $currentDate->diff($birthdate);

        $years = $ageDiff->y;
        $months = $ageDiff->m;
        $days = $ageDiff->d;

        $ageString = "";
        if ($years > 0) {
            $ageString .= $years . "岁";
        }
        if ($months > 0) {
            $ageString .= $months . "月";
        }
        if ($days > 0) {
            $ageString .= $days . "天";
        }

        return $ageString;
    }
}