Explain the relevant content of php to obtain the specified date

Due to work needs, I need to get the start and end dates of the week starting from Thursday, and PHP does not provide a method to get the start and end dates of this week, so I wrote a method for future use.

Calculation method:

format('U');    // 获取日期是周几
    $day = (new DateTime('@'.$timestamp))->format('w');    // 计算开始日期
    if($day>=$start){        $startdate_timestamp = mktime(0,0,0,date('m',$timestamp),date('d',$timestamp)-($day-$start),date('Y',$timestamp));
    }elseif($day<$start){        $startdate_timestamp = mktime(0,0,0,date('m',$timestamp),date('d',$timestamp)-7+$start-$day,date('Y',$timestamp));
    }    // 结束日期=开始日期+6
    $enddate_timestamp = mktime(0,0,0,date('m',$startdate_timestamp),date('d',$startdate_timestamp)+6,date('Y',$startdate_timestamp));    $startdate = (new DateTime('@'.$startdate_timestamp))->format('Y-m-d');    $enddate = (new DateTime('@'.$enddate_timestamp))->format('Y-m-d');    return array($startdate, $enddate);
}?>

Example: The test starts from Monday to Sunday to calculate the start and end time of the week

';
}?>

Output:

date:2016-04-27 week start:0 range:2016-04-24, 2016-04-30date:2016-04-27 week start:1 range:2016-04-25, 2016-05-01date:2016-04-27 week start:2 range:2016-04-26, 2016-05-02date:2016-04-27 week start:3 range:2016-04-27, 2016-05-03date:2016-04-27 week start:4 range:2016-04-21, 2016-04-27date:2016-04-27 week start:5 range:2016-04-22, 2016-04-28date:2016-04-27 week start:6 range:2016-04-23, 2016-04-29

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