Doc #62537 [Com]: Composed class has fatal error with duplicate, equal array properties

Edit report at https://bugs.php.net/bug.php?id=62537&edit=1 ID: 62537 Comment by: walle dot sthlm at gmail dot com Reported by: jeremeamia at gmail dot com Summary: Composed class has fatal error with duplicate, equal array properties Status: Verified Type: Documentation Problem Package: Class/Object related Operating System: * PHP Version: Irrelevant Block user comment: N Private report: N New Comment: The following snippet results in the "definition differs and is considered incompatible" fatal error in 7.0+. Can this be considered as a bug? const VALUE = true; trait Foo {public $var = VALUE;} trait Bar {public $var = VALUE;} class Baz {use Foo, Bar;} https://3v4l.org/kkHFe Previous Comments: ------------------------------------------------------------------------ [2017-03-13 18:34:56] tularis@php.net Automatic comment from SVN on behalf of tularis Revision: http://svn.php.net/viewvc/?view=revision&revision=342111 Log: Documents the issue described in bug 62537. -- Provided by Pedro Magalhães (mail@pmmaga.net) ------------------------------------------------------------------------ [2017-02-09 17:40:36] mail at pmmaga dot net I've included a patch for the documentation on this ticket as well. ------------------------------------------------------------------------ [2017-02-07 23:45:09] requinix@php.net The documentation is indeed out of date. No E_STRICT in PHP 7: - https://3v4l.org/Jafoi matching in two traits - https://3v4l.org/pQYTl matching in traits and class Conflicting definitions: - https://3v4l.org/brZt0 conflict between traits - https://3v4l.org/umfVE conflict between trait and class ------------------------------------------------------------------------ [2017-02-07 23:09:12] mail at pmmaga dot net In PHP7.0, this E_STRICT was dropped as described in the 7.0 docs: http://php.net/manual/en/migration70.incompatible.php > Same (compatible) property in two used traits - Notice removed, triggers no error However, the documentation on traits still mentions the E_STRICT. ------------------------------------------------------------------------ [2013-09-19 09:10:51] gron@php.net I believe this is going to be problematic, because the object/array is not the same, i.e., it is not the same literal, and I assume that I currently check for object identity. Object identity works for most literals, but not arrays. To fix this, special care is required. A value comparison might be possible, and would be necessary here. A simple check for the type is not sufficient, because $var = 1; vs $var = 2; should result in the expected error. But yes, in general, I consider this behavior a bug. ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at https://bugs.php.net/bug.php?id=62537 -- Edit this bug report at https://bugs.php.net/bug.php?id=62537&edit=1