#29446 [Opn->Csd]: PHP 5 allows class constants to be overriden

ID: 29446 Updated by: tony2001@php.net Reported By: dimo dot vanchev at bianor dot com -Status: Open +Status: Closed Bug Type: Zend Engine 2 problem Operating System: Windows 2000 PHP Version: 5.0.3 Assigned To: tony2001 New Comment: Yes, it was fixed only in HEAD (i.e. 5.1.0-dev), as this change can affect some existing scripts. Previous Comments: ------------------------------------------------------------------------ [2005-02-25 14:59:56] dimo dot vanchev at bianor dot com This bug doesn't seem to be fixed in 5.0.3 version, at least for the Windows version. I haven't tryed to reproduce this bug under Linux for 5.0.3 version yet. ------------------------------------------------------------------------ [2004-09-24 09:51:07] dimo dot vanchev at bianor dot com seems to work fine now, great many thanks for improving PHP's quality best regards ------------------------------------------------------------------------ [2004-09-10 15:12:15] tony2001@php.net I mean FIXED in CVS, try latest snapshots. ------------------------------------------------------------------------ [2004-09-10 15:11:12] tony2001@php.net Please try using this CVS snapshot: http://snaps.php.net/php5-latest.tar.gz For Windows: http://snaps.php.net/win32/php5-win32-latest.zip ------------------------------------------------------------------------ [2004-07-29 17:56:54] dimo dot vanchev at bianor dot com Description: ------------ If we declare a class constant twice or more PHP allows this without any notifications. This should be fixed, because it may bring to confusion. A constant should be constant, thus not allowing to be overriden neither in the same class, nor in child classes. Currently non-class constants allow to be overriden too, at least they output a notice saying "Constant already defined". Maybe this should be brought up to warning. Just my thoughts! Reproduce code: --------------- <?php class A { const MY_CONSTANT = "A. value_1"; const MY_CONSTANT = "A. value_2"; public function __construct() { echo self::MY_CONSTANT, "\n"; } } class B extends A { const MY_CONSTANT = "B. value_1"; const MY_CONSTANT = "B. value_2"; public function __construct() { echo self::MY_CONSTANT, "\n"; } } new A(); new B(); ?> Expected result: ---------------- should display warning, error or something like that. Actual result: -------------- A. value_2 B. value_2 ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=29446&edit=1