#28430 [NEW]: Cannot extend built-in classes (mysqli)

From: bert at procurios dot nl Operating system: All PHP version: 5.0.0RC2 PHP Bug Type: Zend Engine 2 problem Bug description: Cannot extend built-in classes (mysqli) 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 bug report at http://bugs.php.net/?id=28430&edit=1 -- Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=28430&r=trysnapshot4 Try a CVS snapshot (php5): http://bugs.php.net/fix.php?id=28430&r=trysnapshot5 Fixed in CVS: http://bugs.php.net/fix.php?id=28430&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=28430&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=28430&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=28430&r=needscript Try newer version: http://bugs.php.net/fix.php?id=28430&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=28430&r=support Expected behavior: http://bugs.php.net/fix.php?id=28430&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=28430&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=28430&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=28430&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=28430&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=28430&r=dst IIS Stability: http://bugs.php.net/fix.php?id=28430&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=28430&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=28430&r=float