Bug #55085 [NEW]: Undocumented BC break with changing __construct() signature

From: Operating system: Irrelevant PHP version: 5.4.0alpha1 Package: Class/Object related Bug Type: Bug Bug description:Undocumented BC break with changing __construct() signature Description: ------------ PHP 5.* allows changing an abstract __construct() signature without any notice. PHP 5.4 issues fatal error. I didn't find this BC break in news.txt so I think that it is a bug. Test script: --------------- <?php abstract class P { abstract function __construct(); } class C extends P { function __construct($a) { } } ?> Expected result: ---------------- Nothing - same as in PHP 5.*. The strange thing is that if we replace "abstract function __construct();" by "function __construct() {}" then the behavior is same as in previous versions. Actual result: -------------- Fatal error: Declaration of C::__construct() must be compatible with that of P::__construct() -- Edit bug report at https://bugs.php.net/bug.php?id=55085&edit=1 -- Try a snapshot (PHP 5.2): https://bugs.php.net/fix.php?id=55085&r=trysnapshot52 Try a snapshot (PHP 5.3): https://bugs.php.net/fix.php?id=55085&r=trysnapshot53 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=55085&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=55085&r=fixed Fixed in SVN and need be documented: https://bugs.php.net/fix.php?id=55085&r=needdocs Fixed in release: https://bugs.php.net/fix.php?id=55085&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=55085&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=55085&r=needscript Try newer version: https://bugs.php.net/fix.php?id=55085&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=55085&r=support Expected behavior: https://bugs.php.net/fix.php?id=55085&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=55085&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=55085&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=55085&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=55085&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=55085&r=dst IIS Stability: https://bugs.php.net/fix.php?id=55085&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=55085&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=55085&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=55085&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=55085&r=mysqlcfg Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=55085&r=trysnapshot54