PHP 获取今日、昨日、本周、上周、本月的等等常用的起始时间戳和结束时间戳的时间处理类

<?php  
class Time  
{  
    /** 
     * 返回今日开始和结束的时间戳 
     * 
     * @return array 
     */  
    public static function today()  
    {  
        return [  
            mktime(0, 0, 0, date('m'), date('d'), date('Y')),  
            mktime(23, 59, 59, date('m'), date('d'), date('Y'))  
        ];  
    }  
   
    /** 
     * 返回昨日开始和结束的时间戳 
     * 
     * @return array 
     */  
    public static function yesterday()  
    {  
        $yesterday = date('d') - 1;  
        return [  
            mktime(0, 0, 0, date('m'), $yesterday, date('Y')),  
            mktime(23, 59, 59, date('m'), $yesterday, date('Y'))  
        ];  
    }  
   
    /** 
     * 返回本周开始和结束的时间戳 
     * 
     * @return array 
     */  
    public static function week()  
    {  
        $timestamp = time();  
        return [  
            strtotime(date('Y-m-d', strtotime("this week Monday", $timestamp))),  
            strtotime(date('Y-m-d', strtotime("this week Sunday", $timestamp))) + 24 * 3600 - 1  
        ];  
    }  
   
    /** 
     * 返回上周开始和结束的时间戳 
     * 
     * @return array 
     */  
    public static function lastWeek()  
    {  
        $timestamp = time();  
        return [  
            strtotime(date('Y-m-d', strtotime("last week Monday", $timestamp))),  
            strtotime(date('Y-m-d', strtotime("last week Sunday", $timestamp))) + 24 * 3600 - 1  
        ];  
    }  
   
    /** 
     * 返回本月开始和结束的时间戳 
     * 
     * @return array 
     */  
    public static function month($everyDay = false)  
    {  
        return [  
            mktime(0, 0, 0, date('m'), 1, date('Y')),  
            mktime(23, 59, 59, date('m'), date('t'), date('Y'))  
        ];  
    }  
   
    /** 
     * 返回上个月开始和结束的时间戳 
     * 
     * @return array 
     */  
    public static function lastMonth()  
    {  
        $begin = mktime(0, 0, 0, date('m') - 1, 1, date('Y'));  
        $end = mktime(23, 59, 59, date('m') - 1, date('t', $begin), date('Y'));  
   
        return [$begin, $end];  
    }  
   
    /** 
     * 返回今年开始和结束的时间戳 
     * 
     * @return array 
     */  
    public static function year()  
    {  
        return [  
            mktime(0, 0, 0, 1, 1, date('Y')),  
            mktime(23, 59, 59, 12, 31, date('Y'))  
        ];  
    }  
   
    /** 
     * 返回去年开始和结束的时间戳 
     * 
     * @return array 
     */  
    public static function lastYear()  
    {  
        $year = date('Y') - 1;  
        return [  
            mktime(0, 0, 0, 1, 1, $year),  
            mktime(23, 59, 59, 12, 31, $year)  
        ];  
    }  
   
    public static function dayOf()  
    {  
   
    }  
   
    /** 
     * 获取几天前零点到现在/昨日结束的时间戳 
     * 
     * @param int $day 天数 
     * @param bool $now 返回现在或者昨天结束时间戳 
     * @return array 
     */  
    public static function dayToNow($day = 1, $now = true)  
    {  
        $end = time();  
        if (!$now) {  
            list($foo, $end) = self::yesterday();  
        }  
   
        return [  
            mktime(0, 0, 0, date('m'), date('d') - $day, date('Y')),  
            $end  
        ];  
    }  
   
    /** 
     * 返回几天前的时间戳 
     * 
     * @param int $day 
     * @return int 
     */  
    public static function daysAgo($day = 1)  
    {  
        $nowTime = time();  
        return $nowTime - self::daysToSecond($day);  
    }  
   
    /** 
     * 返回几天后的时间戳 
     * 
     * @param int $day 
     * @return int 
     */  
    public static function daysAfter($day = 1)  
    {  
        $nowTime = time();  
        return $nowTime + self::daysToSecond($day);  
    }  
   
    /** 
     * 天数转换成秒数 
     * 
     * @param int $day 
     * @return int 
     */  
    public static function daysToSecond($day = 1)  
    {  
        return $day * 86400;  
    }  
   
    /** 
     * 周数转换成秒数 
     * 
     * @param int $week 
     * @return int 
     */  
    public static function weekToSecond($week = 1)  
    {  
        return self::daysToSecond() * 7 * $week;  
    }  
   
    private static function startTimeToEndTime()  
    {  
   
    }  
}  
   
?>