php date mktime strtotime 获取时间方法

 
<?php
/**
 * 获得系统年份数组
 */
function getSystemYearArr(){
  $year_arr = array('2010'=>'2010','2011'=>'2011','2012'=>'2012','2014'=>'2014','2014'=>'2014','2015'=>'2015','2016'=>'2016','2017'=>'2017','2018'=>'2018','2019'=>'2019','2020'=>'2020');
    return $year_arr;
}
/**
 * 获得系统月份数组
 */
function getSystemMonthArr(){
    $month_arr = array('1'=>'01','2'=>'02','3'=>'03','4'=>'04','5'=>'05','6'=>'06','7'=>'07','8'=>'08','9'=>'09','10'=>'10','11'=>'11','12'=>'12');
    return $month_arr;
}
/**
 * 获得系统周数组
 */
function getSystemWeekArr(){
    $week_arr = array('1'=>'周一','2'=>'周二','3'=>'周三','4'=>'周四','5'=>'周五','6'=>'周六','7'=>'周日');
    return $week_arr;
}
/**
 * 获取某月的最后一天
 */
function getMonthLastDay($year, $month){
    $t = mktime(0, 0, 0, $month + 1, 1, $year);
    $t = $t - 60 * 60 * 24;
    return $t;
}
/**
 * 获得系统某月的周数组，第一周不足的需要补足
 */
function getMonthWeekArr($current_year, $current_month){
    //该月第一天
    $firstday = strtotime($current_year.'-'.$current_month.'-01');
    //该月的第一周有几天
    $firstweekday = (7 - date('N',$firstday) +1);
    //计算该月第一个周一的时间
    $starttime = $firstday-3600*24*(7-$firstweekday);
    //该月的最后一天
    $lastday = strtotime($current_year.'-'.$current_month.'-01'." +1 month -1 day");
    //该月的最后一周有几天
    $lastweekday = date('N',$lastday);
    //该月的最后一个周末的时间
    $endtime = $lastday-3600*24*$lastweekday;
    $step = 3600*24*7;//步长值
    $week_arr = array();
    for ($i=$starttime; $i<$endtime; $i= $i+3600*24*7){
        $week_arr[] = array('key'=>date('Y-m-d',$i).'|'.date('Y-m-d',$i+3600*24*6), 'val'=>date('Y-m-d',$i).'~'.date('Y-m-d',$i+3600*24*6));
    }
    return $week_arr;
}
/**
 * 获取本周的开始时间和结束时间
 */
function getWeek_SdateAndEdate($current_time){
    $current_time = strtotime(date('Y-m-d',$current_time));
    $return_arr['sdate'] = date('Y-m-d', $current_time-86400*(date('N',$current_time) - 1));
    $return_arr['edate'] = date('Y-m-d', $current_time+86400*(7- date('N',$current_time)));
    return $return_arr;
}
//查询当天、前3天、本周、本月、本年的时间
echo date("y-m-d",mktime(0, 0 , 0,date("m"),date("d"),date("Y"))-86400*3); //当前日期往前推3天
//thinkphp 里面查询当天、本周、本月、本年的时间
 $time=I('get.time');
        switch ($time) {
            case 'day':
               $startTime=date("Y-m-d");
               $endTime=date("Y-m-d");
                break;
            case 'week':
               $startTime=date("Y-m-d",mktime(0, 0 , 0,date("m"),date("d")-date("w")+1,date("Y")));
               $endTime =date("Y-m-d",mktime(23,59,59,date("m"),date("d")-date("w")+7,date("Y")));
                break;
            case 'month':
               $startTime = date("Y-m-d",mktime(0, 0 , 0,date("m"),1,date("Y")));
               $endTime=date("Y-m-d",mktime(23,59,59,date("m"),date("t"),date("Y")));
                break;
            case 'year':
               $startTime=date("Y").'-01-01';
               $endTime=date("Y").'-12-31';
                break;
            default:
                break;
        }
  
//其他方式获取PHP获取上周、本周、上月、本月、本季度、上季度时间方法大全
 echo date("Ymd",strtotime("now")), "\\n";
    echo date("Ymd",strtotime("-1 week Monday")), "\\n";
    echo date("Ymd",strtotime("-1 week Sunday")), "\\n";
    echo date("Ymd",strtotime("+0 week Monday")), "\\n";
    echo date("Ymd",strtotime("+0 week Sunday")), "\\n";
   
    echo "*********第几个月:";
    echo date('n');
    echo "*********本周周几:";
    echo date("w");
    echo "*********本月天数:";
    echo date("t");
    echo "*********";
   
    echo '<br>上周起始时间:<br>';
    echo date("Y-m-d H:i:s",mktime(0, 0 , 0,date("m"),date("d")-date("w")+1-7,date("Y"))),"\\n";
    echo date("Y-m-d H:i:s",mktime(23,59,59,date("m"),date("d")-date("w")+7-7,date("Y"))),"\\n";
    echo '<br>本周起始时间:<br>';
    echo date("Y-m-d H:i:s",mktime(0, 0 , 0,date("m"),date("d")-date("w")+1,date("Y"))),"\\n";
    echo date("Y-m-d H:i:s",mktime(23,59,59,date("m"),date("d")-date("w")+7,date("Y"))),"\\n";
   
    echo '<br>上月起始时间:<br>';
    echo date("Y-m-d H:i:s",mktime(0, 0 , 0,date("m")-1,1,date("Y"))),"\\n";
    echo date("Y-m-d H:i:s",mktime(23,59,59,date("m") ,0,date("Y"))),"\\n";
    echo '<br>本月起始时间:<br>';
    echo date("Y-m-d H:i:s",mktime(0, 0 , 0,date("m"),1,date("Y"))),"\\n";
    echo date("Y-m-d H:i:s",mktime(23,59,59,date("m"),date("t"),date("Y"))),"\\n";
   
    $season = ceil((date('n'))/3);//当月是第几季度
    echo '<br>本季度起始时间:<br>';
    echo date('Y-m-d H:i:s', mktime(0, 0, 0,$season*3-3+1,1,date('Y'))),"\\n";
    echo date('Y-m-d H:i:s', mktime(23,59,59,$season*3,date('t',mktime(0, 0 , 0,$season*3,1,date("Y"))),date('Y'))),"\\n";
   
    $season = ceil((date('n'))/3)-1;//上季度是第几季度
    echo '<br>上季度起始时间:<br>';
    echo date('Y-m-d H:i:s', mktime(0, 0, 0,$season*3-3+1,1,date('Y'))),"\\n";
    echo date('Y-m-d H:i:s', mktime(23,59,59,$season*3,date('t',mktime(0, 0 , 0,$season*3,1,date("Y"))),date('Y'))),"\\n";