php 时间操作工具类

最近维护公司的项目，报表功能有个计算周月均值的功能。就是选取一段时间算自然周月的数据平均值。
比如 20191015 - 20191029 是有三个自然周的（其中有不是整周的自然周），我需要把这三个自然周找到，算出这三个自然周的数据平均值，算出结果后类似下图：

只是类似这样的折线图。

<?php
/**
 * Created by PhpStorm.
 * User: v_bivwei
 * Date: 2019/10/21
 * Time: 10:56
 * Desc: 时间处理工具类
 */

class ReportDateTools
{

    /**
     * @param $begin
     * @param $end
     * @param string $type
     * @return array
     * @description 获取一段时间的连续日期列表
     * @author v_bivwei
     */
    public static function timeList($begin, $end, $type = 'string')
    {
        $begin = strtotime($begin);
        $end = strtotime($end);
        $list = array();
        switch ($type) {
            case 'string':
                for ($i = $begin; $i <= $end; $i += (24 * 3600)) {
                    $list[] = date("Y-m-d", $i);
                }
                break;
            case 'int':
                for ($i = $begin; $i <= $end; $i += (24 * 3600)) {
                    $list[] = date("Ymd", $i);
                }
                break;
        }
        return $list;
    }


    /**
     * @param $startdate
     * @param $enddate
     * @param string $type
     * @return array
     * @description 获取一段时间的连续自然周
     * @author v_bivwei
     */
    public static function getWeek($startdate, $enddate, $type = 'string')
    {
        $beginDate = $startdate;
        $endDate = $enddate;
        //参数不能为空
        if (!empty($startdate) && !empty($enddate)) {

            //先把两个日期转为时间戳
            $startdate = strtotime($startdate);
            $enddate = strtotime($enddate);
            //开始日期不能大于结束日期
            if ($startdate <= $enddate) {
                $end_date = strtotime("next monday", $enddate);
                if (date("w", $startdate) == 1) {
                    $start_date = $startdate;
                } else {
                    $start_date = strtotime("last monday", $startdate);
                }
                //计算时间差多少周
                $countweek = ($end_date - $start_date) / (7 * 24 * 3600);
                for ($i = 0; $i < $countweek; $i++) {
                    if ($type == 'string') {
                        $sd = date("Y-m-d", $start_date);
                    } else {
                        $sd = date("Ymd", $start_date);
                    }
                    $ed = strtotime("+ 6 days", $start_date);
                    if ($type == 'string') {
                        $eed = date("Y-m-d", $ed);
                    } else {
                        $eed = date("Ymd", $ed);
                    }
                    $arr[] = array(
                        $sd,
                        $eed
                    );
                    $start_date = strtotime("+ 1 day", $ed);
                }

                $timeList = self::timeList($beginDate, $endDate, $type);
                foreach ($arr as $key => &$item) {
                    $diff = array_diff($item, $timeList);
                    if (empty($diff)) {
                        $item['full'] = true;
                        $list = self::timeList($item[0], $item[1], $type);
                        $item['list'] = array_values(array_intersect($timeList, $list));
                    } else {
                        $item['full'] = false;
                        $list = self::timeList($item[0], $item[1], $type);
                        $item['list'] = array_values(array_intersect($timeList, $list));
                    }
                }

                return $arr;
            }
        }
    }


    /**
     * @param $start
     * @param $end
     * @param string $type
     * @return array
     * @description 获取一段时间的连续自然月
     * @author v_bivwei
     */
    public static function getMonth($start, $end, $type = 'string')
    {
        $startDate = $start;
        $endDate = $end;
        $end = date('Ym', strtotime($end)); // 转换为月
        $range = array();
        $i = 0;
        do {
            $month = date('Ym', strtotime($start . ' + ' . $i . ' month'));
            $range[] = $month;
            $i++;
        } while ($month < $end);

        $_ret = array();
        $ret = array();

        foreach ($range as $key => $item) {
            switch ($type) {
                case 'string':
                    $firstday = date('Y-m-01', strtotime($item . "01")); //月初
                    $lastday = date('Y-m-d', strtotime("$firstday +1 month -1 day"));//月末
                    break;
                case 'int':
                    $firstday = date('Ym01', strtotime($item . "01")); //月初
                    $lastday = date('Ymd', strtotime("$firstday +1 month -1 day"));//月末
                    break;
            }
            $_ret[$item] = array(
                $firstday,
                $lastday
            );
        }

        $timeList = self::timeList($startDate, $endDate, $type);
        foreach ($_ret as $key => &$value) {
            $diff = array_diff($value, $timeList);
            if (empty($diff)) {
                $value['full'] = true;
                $list = self::timeList($value[0], $value[1], $type);
                $value['list'] = array_values(array_intersect($timeList, $list));
            } else {
                $value['full'] = false;
                $list = self::timeList($value[0], $value[1], $type);
                $value['list'] = array_values(array_intersect($timeList, $list));
            }
            $ret[$key] = $value;
        }

        return $ret;
    }

}

使用示例：

<?php
/**
 * Created by PhpStorm.
 * User: v_bivwei
 * Date: 2019/10/22
 * Time: 11:49
 */

require_once 'ReportDateTools.php';

$startDate = '20191015';
$endDate = '20191029';
$type = 'int';
$timeList = ReportDateTools::timeList($startDate, $endDate, $type);
$weeks = ReportDateTools::getWeek($startDate, $endDate, $type);
$months = ReportDateTools::getMonth($startDate, $endDate, $type);
var_dump($timeList, $weeks, $months);

结果：