Bug #75607 [NEW]: b/c break in traits causes fatal error

From: stuart at stuartherbert dot com Operating system: Ubuntu 17.10 PHP version: 7.2.0 Package: Class/Object related Bug Type: Bug Bug description:b/c break in traits causes fatal error Description: ------------ In 7.2.0, using two traits that define the same static property cause a fatal error. Only static properties are affected. I've put this up on https://3v4l.org/oi4ns to show the behaviour on different PHP versions. I couldn't find this documented in the PHP 7.2.0 release notes / migration guide. Test script: --------------- https://3v4l.org/oi4ns <?php trait T1 { public static $prop1 = 1; } trait T2 { public static $prop1 = 1; } class Base { use T1; } class Child extends base { use T2; } Expected result: ---------------- Expected behaviour: - no fatal errors, no warnings, code executes Actual result: -------------- Actual behaviour: - fatal error: Fatal error: Base and T2 define the same property ($prop1) in the composition of Child. However, the definition differs and is considered incompatible. Class was composed in /in/oi4ns on line 18 -- Edit bug report at https://bugs.php.net/bug.php?id=75607&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=75607&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=75607&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=75607&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=75607&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=75607&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=75607&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=75607&r=needscript Try newer version: https://bugs.php.net/fix.php?id=75607&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=75607&r=support Expected behavior: https://bugs.php.net/fix.php?id=75607&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=75607&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=75607&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=75607&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=75607&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=75607&r=dst IIS Stability: https://bugs.php.net/fix.php?id=75607&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=75607&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=75607&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=75607&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=75607&r=mysqlcfg