Bug #8661 Updated: a copy of the internal array elements is sometimes not made

ID: 8661 Updated by: jmoore Reported By: lgordon@idiotbrain.com Old-Status: Analyzed Status: Duplicate Bug Type: Scripting Engine problem PHP Version: 4.0.4 Assigned To: Comments: dup of 8130 Previous Comments: --------------------------------------------------------------------------- [2001-03-16 03:58:55] lgordon@idiotbrain.com I don't agree with this. The zend engine only does a shallow copy in this particular instance, and it is a bug. If the array is not accessed through a method in the object, the copy is performed correctly. Please re-analyze this. --------------------------------------------------------------------------- [2001-03-15 09:20:44] stas@php.net Zend copies arrays and objects "shallow" (for performance reasons). The workaround is to implement "clone" method. This probably should be built-in function in Zend. --------------------------------------------------------------------------- [2001-02-28 00:21:05] lgordon@idiotbrain.com My bad, my email address is larry@idiotbrain.com Please detail on a fix for this bug. Thanks, Larry --------------------------------------------------------------------------- [2001-01-11 16:55:42] lgordon@idiotbrain.com The workaround that I have had to implement is doing an explicit clone method (similar to a copy constructor) and when making a copy, say $new = $old->clone(); instead of $new = $old; example implementation: class Element { var $value; function &clone() { $obj = new Element(); $obj=>value = $this->value; } } class X { var $array; function &clone() { $obj = new X(); foreach($this->array as $index => $value) { $obj->array[$index] = $value->clone(); } return $obj; } } --------------------------------------------------------------------------- [2001-01-11 16:46:44] lgordon@idiotbrain.com Yes, this is the same, if I change the method to do_nothing() in the Element class and print out a message, the same behavior happens. The behavior is that if I call a method on an array object after the array has been copied, the copy now refers to the original. Also, if the method is called on the original object, the copy is then linked with the original. --------------------------------------------------------------------------- The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online. ATTENTION! Do NOT reply to this email! To reply, use the web interface found at http://bugs.php.net/?id=8661&edit=2