#28430 [Opn->Csd]: Cannot extend built-in classes (mysqli)

ID: 28430 Updated by: georg@php.net Reported By: bert at procurios dot nl -Status: Open +Status: Closed Bug Type: MySQL related Operating System: * PHP Version: 5.0.0RC2 Assigned To: georg New Comment: This bug has been fixed in CVS. 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/. Thank you for the report, and for helping us make PHP better. Previous Comments: ------------------------------------------------------------------------ [2004-05-21 18:31:01] helly@php.net The classes in mysqli either need to be final or they need to be made extendable. ------------------------------------------------------------------------ [2004-05-21 18:25:35] helly@php.net some of the internal classas cannot be extended and unfortunatley they are not marked as 'final' right now. For you that means you need to extend it by a proxy class that reimplements the original class protocol and uses the original class as a property. ------------------------------------------------------------------------ [2004-05-18 12:02:25] bert at procurios dot nl Description: ------------ Extending the built-in class 'mysqli' doesn't give the expected and desired result. The extended class doesn't have the members the parent class has and is unusable. We found a related mailinglist entry from more than a year ago: http://www.zend.com/lists/engine2/200302/msg00244.html The possibility to extend built-in classes is a major feature in PHP5 - at least for us ;). The reproduce code below is a minimal testcase - other more complicated tests failed as well. Reproduce code: --------------- class DB extends mysqli { } $DB1 = new DB('localhost', 'root', '', 'probase2'); $DB2 = new mysqli('localhost', 'root', '', 'probase2'); var_dump($DB1->thread_id); var_dump($DB1->error); var_dump($DB1->errno); var_dump($DB2->thread_id); var_dump($DB2->error); var_dump($DB2->errno); Expected result: ---------------- int(97) string(0) "" int(0) int(98) string(0) "" int(0) Actual result: -------------- <br /> <b>Notice</b>: Undefined property: DB::$thread_id in <b>d:\htdocs_php5\ProBase2\TRUNK\probase\libsys\test.php</b> on line <b>10</b><br /> NULL <br /> <b>Notice</b>: Undefined property: DB::$error in <b>d:\htdocs_php5\ProBase2\TRUNK\probase\libsys\test.php</b> on line <b>11</b><br /> NULL <br /> <b>Notice</b>: Undefined property: DB::$errno in <b>d:\htdocs_php5\ProBase2\TRUNK\probase\libsys\test.php</b> on line <b>12</b><br /> NULL int(97) string(0) "" int(0) ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=28430&edit=1