date_modify

(PHP 5 >= 5.2.0, PHP 7, PHP 8)

说明

此函数是该函数的别名： DateTime::modify()

User Contributed Notes

ochojnackiATEMEgmail.com 14-Aug-2008 05:49


$cday - specified day of the week (0-6 where 0 is Sunday)

$currentDate - date of start

$endDate - date of end



We need dates of next couple of days, that day of week  match defined.



<?php



            if($currentDate->format('w')!= $cday){

            switch ($cday){ 

            case 0 : $cdays="Sunday"; break;

            case 1 : $cdays="Monday"; break;

            case 2 : $cdays="Tuesday"; break;

            case 3 : $cdays="Wednesday"; break;

            case 4 : $cdays="Thursday"; break;

            case 5 : $cdays="Friday"; break;

            case 6 : $cdays="Saturday";

            }    

            date_modify($currentDate,"+1 {$cdays}");

            }

            

    

            while($currentDate < $endDate) {

              echo $currentDate -> format('Y-m-d H:i:s');

              $currentDate      -> modify('+1 week');

            }



?>

matthijs at yourmediafactory dot com 08-Dec-2007 04:38


I have trouble finding the documentation for the dateTime object, but this seems to work:



<?php

$currentDate = new DateTime('2008-01-04');

$endDate     = new DateTime('2009-01-04');



while($currentDate < $endDate) {

  echo $currentDate -> format('Y-m-d') . ' till '; 

  $currentDate      -> modify('+1 week');

  echo $currentDate -> format('Y-m-d') . ' <br />';

}

?>



This will (obviously) print a list of date-ranges between startdate and enddate.

someone 14-Sep-2007 11:46


I decided to enhance the DateTime object by taking advantage of method chaining.



<?php



class DateTimeChain extends DateTime {



    public function modify ($modify) {

        parent::modify($modify);

        return $this;

    }



    public function setDate ($year, $month, $day) {

        parent::setDate($year, $month, $day);

        return $this;

    }



    public function setISODate ($year, $week, $day = null) {

        parent:: setISODate($year, $week, $day);

        return $this;

    }



    public function setTime ($hour, $minute, $second = null) {

        parent::setTime($hour, $minute, $second);

        return $this;

    }



    public function setTimezone ($timezone) {

        parent::setTimezone($timezone);

        return $this;

    }



}



$t = new DateTimeZone('America/Los_Angeles');

$d = new DateTimeChain();

var_dump($d->setTimezone($t)->modify('5years')->format(DATE_RFC822));



?>