Bug #62532 [Opn->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 Updated by: nikic@php.net Reported by: matthew1471 at matthew1471 dot co dot uk Summary: Changes To A Copied DateTime Variable Always Changes Original -Status: Open +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: 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; Previous Comments: ------------------------------------------------------------------------ [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