Traits related issue

[nikita2206]

Hi, Zeev! Glad to hear that Zend Optimizer+ finally open sourced! There's this bug I found, it's actually very strange, because it reproducible fairly easy.
Anyway, there's description:

Environment: Ubuntu 12.04 with PHP compiled, here's php -v output:

PHP 5.4.9 (cli) (built: Feb 12 2013 17:14:19) 
Copyright (c) 1997-2012 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2012 Zend Technologies
    with Xdebug v2.2.1, Copyright (c) 2002-2012, by Derick Rethans
    with Zend Optimizer+ v7.0.0, Copyright (c) 1999-2013, by Zend Technologies

php.ini contents:

include_path=/usr/local/lib/php

date.timezone=Europe/Moscow

extension=amqp.so
;extension=apc.so
zend_extension=/usr/local/lib/php/extensions/no-debug-non-zts-20100525/xdebug.so
zend_extension=/usr/local/lib/php/extensions/no-debug-non-zts-20100525/ZendOptimizerPlus.so

;apc.enabled=1
zend_optimizerplus.enable=1
zend_optimizerplus.memory_consumption=128
zend_optimizerplus.save_comments=1

Code reproducing the bug:

<?php

trait FooTrait
{
    public function foo()
    {
        return "foo";
    }
}


class BarClass
{
    use FooTrait;
}

var_dump((new BarClass())->foo());

Expected output:

string(3) "foo"

First run output:

string(3) "foo"

Second and subsequent runs output:

Fatal error: Call to undefined method BarClass::foo()

This bug is reproducible on fpm, but not on cli.

[zendtech]

Hi Nikita,

Thanks for comments. Can you reproduce the same problem without xdebug?
I tried your test case with FastCGI SAPI without xdebug, and didn't get any problems.
I suppose it somehow must be related to xdebug, may be caused by extension loading/initialization order...

Thanks. Dmitry.

[zendtech]

I can't reproduce it even with xdebug (still FastCGI SAPI).
Do I need to set any xdebug configuration directives?
Please, try to localize the problem.

[nikita2206]

Hello again, yes, sorry for not answering. While you can't reproduce it w/ xdebug, I can reproduce it even w/o it, so I think xdebug is not the one who causes the problem. I'm trying to debug it now, unfortunately I don't have much skills in C (I'm debugging it using zend_printf output...). If it can give you any clue: I found that when zend_class_copy_ctor called, class_entry of BarClass has num_traits equal to zero (on first and all subsequent runs).

If it can help, here's more info about my environment:

uname -a
Linux nikita2206-N56VJ 3.2.0-37-generic #58-Ubuntu SMP Thu Jan 24 15:28:10 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

php -i: https://gist.github.com/nikita2206/4951643

[zendtech]

Traits are added at run-time by ZEND_ADD_TRAIT and ZEND_BIND_TRAITS opcodes, so it's expected that " when zend_class_copy_ctor called, class_entry of BarClass has num_traits equal to zero".

I think - something is wrong with your PHP configuration or build. try to disable all php extetnsions.

[nikita2206]

I rechecked PHP on tag 5.4.11, recompiled it, now all works fine, sorry for bothering.

[zendtech]

Great!

[fotografi]

No description provided.