PHP gets the specified date between the first and last day of each month

PHP strtotime and date functions are used.

1. Obtain the first day of the month in which the specified date resides

function getMonthFirstDay($date) {
    return date('Y-m-01',strtotime($date));
}
Copy the code

2. Obtain the last day of the month in which the specified date resides

function getMonthEndDay($date) {
    $firstDay = getMonthFirstDay($date);
    return date("Y-m-d",strtotime("$firstDay +1 month -1 day"));
}
Copy the code

3. Get the first and last day of each month between the specified dates

function splitMonths($startTime,$endTime) {
    if (strtotime($startTime) > strtotime($endTime)) {
        return false;
    }
    $res = array();
    $startDay = date('Y-m-d',strtotime($startTime));
    $firstEndDay = getMonthEndDay($startTime);
    $lastStartDay = getMonthFirstDay($endTime);
    $lastEndDay = date('Y-m-d',strtotime($endTime));
    //$res[] = array($startDay,$firstEndDay);
    while (strtotime($startDay) < strtotime($lastStartDay)) {
        $endDay = getMonthEndDay($startDay);
        $res[] = array($startDay,$endDay);
        $startDay = date('Y-m-01',strtotime("$startDay +1 month"));
        
        
    }
    $res[] = array($startDay,$lastEndDay);
    return $res;
}
Copy the code

For example, enter start_date=2017-02-15&end_date=2017-05-25

array(4) {
  [0]=>
  array(2) {
    [0]=>
    string(10) "2017-02-15"
    [1]=>
    string(10) "2017-02-28"
  }
  [1]=>
  array(2) {
    [0]=>
    string(10) "2017-03-01"
    [1]=>
    string(10) "2017-03-31"
  }
  [2]=>
  array(2) {
    [0]=>
    string(10) "2017-04-01"
    [1]=>
    string(10) "2017-04-30"
  }
  [3]=>
  array(2) {
    [0]=>
    string(10) "2017-05-01"
    [1]=>
    string(10) "2017-05-25"
  }
}
Copy the code