note 113206 added to datetime.add

If you need add() and sub() that don't modify object values, you can create new methods like this: <?php class DateTimeEnhanced extends DateTime { public function returnAdd(DateInterval $interval) { $dt = clone $this; $dt->add($interval); return $dt; } public function returnSub(DateInterval $interval) { $dt = clone $this; $dt->sub($interval); return $dt; } } $interval = DateInterval::createfromdatestring('+1 day'); $dt = new DateTimeEnhanced; # initialize new object echo $dt->format(DateTime::W3C) . "\n"; # 2013-09-12T15:01:44+02:00 $dt->add($interval); # this modifies the object values echo $dt->format(DateTime::W3C) . "\n"; # 2013-09-13T15:01:44+02:00 $dtNew = $dt->returnAdd($interval); # this returns the new modified object and doesn't change original object echo $dt->format(DateTime::W3C) . "\n"; # 2013-09-13T15:01:44+02:00 echo $dtNew->format(DateTime::W3C) . "\n"; # 2013-09-14T15:01:44+02:00 ---- Server IP: 69.147.83.199 Probable Submitter: 92.63.27.15 ---- Manual Page -- http://php.net/manual/en/datetime.add.php Edit -- https://master.php.net/note/edit/113206 Del: integrated -- https://master.php.net/note/delete/113206/integrated Del: useless -- https://master.php.net/note/delete/113206/useless Del: bad code -- https://master.php.net/note/delete/113206/bad+code Del: spam -- https://master.php.net/note/delete/113206/spam Del: non-english -- https://master.php.net/note/delete/113206/non-english Del: in docs -- https://master.php.net/note/delete/113206/in+docs Del: other reasons-- https://master.php.net/note/delete/113206 Reject -- https://master.php.net/note/reject/113206 Search -- https://master.php.net/manage/user-notes.php