Bug #62532 [Nab]: Changes To A Copied DateTime Variable Always Changes Original
Edit report at https://bugs.php.net/bug.php?id=62532&edit=1
ID: 62532
User updated by: matthew1471 at matthew1471 dot co dot uk
Reported by: matthew1471 at matthew1471 dot co dot uk
Summary: Changes To A Copied DateTime Variable Always Changes
Original
Status: Not a bug
Type: Bug
Package: Scripting Engine problem
Operating System: Windows Server 2003 SP2
PHP Version: 5.3.14
Block user comment: N
Private report: N
New Comment:
Thanks, I thought my array code meant it was not by design... but having thought about it perhaps
arrays are treated the same as primitive types.
Thanks for confirming it's not a bug. I hope this gets archived for others to find on their
searches :)
I used "clone" in the example for those that are looking to see an example of its usage,
just didn't think that was the recommended way of manipulating the 2 variables.
Matthew
Previous Comments:
------------------------------------------------------------------------
[2012-07-11 19:19:56] nikic@php.net
Heh, sorry for that default message at the top of my comment. Clicked on the wrong thing :/
------------------------------------------------------------------------
[2012-07-11 19:19:08] nikic@php.net
Sorry, but your problem does not imply a bug in PHP itself. For a
list of more appropriate places to ask for help using PHP, please
visit http://www.php.net/support.php as this bug system
is not the
appropriate forum for asking support questions. Due to the volume
of reports we can not explain in detail here why your report is not
a bug. The support channels will be able to provide an explanation
for you.
Thank you for your interest in PHP.
$foo = $bar does not copy the object in PHP. It just creates a new variable pointing to the same
object.
If you want to really copy the object use
$foo = clone $bar;
------------------------------------------------------------------------
[2012-07-11 14:20:19] matthew1471 at matthew1471 dot co dot uk
Description:
------------
Interacting with a copied DateTime variable (without using the reference '&' syntax)
still changes the original variable.
Test script:
---------------
<?php
// Get today's date.
$originalDate = date_create();;
// Take a copy.
$copiedDate = $originalDate;
// This *will* work for some reason : $copiedDate = clone $originalDate;
echo 'originalDate=' . date_format($originalDate, 'Y-m-d') .
'<br/>';
// Add 1 day.
date_add($copiedDate, date_interval_create_from_date_string('1 days'));
// This doesn't work either : $copiedDate->add(date_interval_create_from_date_string('1
days'));
// $originalDate *SHOULD* still be the same.
echo 'originalDate=' . date_format($originalDate, 'Y-m-d') .
'<br/>';
// This behaviour if desired is different with other objects:
$originalString = array('Sausages');
echo $originalString[0] . '<br/>';
$copiedString = $originalString;
$copiedString[0] = 'Ice Cream';
echo $originalString[0] . '<br/>';
?>
Expected result:
----------------
The $originalDate to remain the same as it was before $copiedDate was changed.
Actual result:
--------------
$originalDate changes.
------------------------------------------------------------------------
--
Edit this bug report at https://bugs.php.net/bug.php?id=62532&edit=1
Thread (4 messages)