获取今日,昨日,上周,上月起始结束时间

        $beginToday = mktime(0,0,0,date('m'),date('d'),date('Y'));
        $endToday = mktime(0,0,0,date('m'),date('d')+1,date('Y'))-1;



        //php获取昨日起始时间戳和结束时间戳
        $beginYesterday = mktime(0,0,0,date('m'),date('d')-1,date('Y'));
        $endYesterday = mktime(0,0,0,date('m'),date('d'),date('Y'))-1;


        //php获取上周起始时间戳和结束时间戳
        $beginLastweek = mktime(0,0,0,date('m'),date('d')-date('w')+1-7,date('Y'));
        $endLastweek = mktime(23,59,59,date('m'),date('d')-date('w')+7-7,date('Y'));
//php获取本月起始时间戳和结束时间戳
        $beginThismonth = mktime(0,0,0,date('m'),1,date('Y'));
        $endThismonth = mktime(23,59,59,date('m'),date('t'),date('Y'));

        echo $beginThismonth . '-' . $endThismonth . '<br/>';
        echo date('Y-m-d H:i:s',$beginThismonth) . '-' . date('Y-m-d H:i:s',$endThismonth);
        exit;