#20842 [Asn->Csd]: No explanation of object comparison and copying

ID: 20842 Updated by: jmcastagnetto@php.net Reported By: dparks at verinform dot com -Status: Assigned +Status: Closed Bug Type: Documentation problem Operating System: Any PHP Version: 4.2.3 Assigned To: jmcastagnetto New Comment: This bug has been fixed in CVS. In case this was a PHP problem, snapshots of the sources are packaged every three hours; this change will be in the next snapshot. You can grab the snapshot at http://snaps.php.net/. In case this was a documentation problem, the fix will show up soon at http://www.php.net/manual/. In case this was a PHP.net website problem, the change will show up on the PHP.net site and on the mirror sites in short time. Thank you for the report, and for helping us make PHP better. Previous Comments: ------------------------------------------------------------------------ [2002-12-10 14:51:56] jmcastagnetto@php.net Assigning this bug to myself so I won't forget to add examples to the docs. ------------------------------------------------------------------------ [2002-12-08 18:32:44] dparks at verinform dot com http://www.php.net/manual/en/language.constants.php says a notice should be generated. I did not get a notice. Maybe we have notice-level messages turned of on php.ini or something like that? I'll check this again when I get to work tomorrow. ------------------------------------------------------------------------ [2002-12-08 06:02:31] m dot ford at lmu dot ac dot uk Re: > Argh!! Apparently, PHP evaluates > > $this->val = val; > > without error, treating val like 'val'. I can't find this documented in > the manual. The following appears in the manual page for Constants (http://www.php.net/manual/en/language.constants.php): http://uk.php.net/manual/en/language.constants.php > If you use an undefined constant, PHP assumes that you > mean the name of the constant itself. A notice will be > issued when this happens. Admittedly this is not very obvious, but it is there. Perhaps an additional note somewhere in the section on strings would be appropriate, as this seems to be a fairly common error (particularly in array subscripts!). Cheeers! ------------------------------------------------------------------------ [2002-12-07 06:40:43] goba@php.net Jesus, it would be nice to have your examples in the documentation. I cannot add it right now, unfortunately. ------------------------------------------------------------------------ [2002-12-05 19:53:03] dparks at verinform dot com Argh!! Apparently, PHP evaluates $this->val = val; without error, treating val like 'val'. I can't find this documented in the manual. The code posted near the end of the bug at http://bugs.php.net/bug.php?id=20681 (look for [28 Nov 2:02pm] moriyoshi@php.net) contains an error like this, which was not noticed by 4 people. Because of this, the code returns true for all comparisons. The behavior you describe is what I expected. Sorry about the mixup. It would still be nice to have an explanation about how copies (assignment) are done on objects -- is this a deep value copy? How are references handled? Also, it would be nice if the comparison operator page explained how recursion is handled. ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at http://bugs.php.net/20842 -- Edit this bug report at http://bugs.php.net/?id=20842&edit=1