Can PHP Traits be disabled in 5.4.x?

Question

I have a client using Rackspace Cloud Sites which advertise PHP 5.4 on their platform but I have been advised via their online support that traits cannot be used.

When using traits I receive a 500 error and finding no issue with the code I asked their online support to be told "it is not allowed in our environment". Using the basic PHP example code below results in a 500 Internal Server Error:

class Base {
    public function sayHello() {
        echo 'Hello ';
    }
}

trait SayWorld {
    public function sayHello() {
        parent::sayHello();
        echo 'World!';
    }
}

class MyHelloWorld extends Base {
    use SayWorld;
}

$o = new MyHelloWorld();
$o->sayHello();

Is there some reason why Traits would be disabled or can they even be disabled? The version reported by phpinfo() is 5.4.10.

Wut? That's the weirdest thing I've ever heard. There's no rational reason to disable traits; it's not like it's a security critical feature. Might as well disable classes and interfaces while you're at it. Sure that rep wasn't talking out of their behind? — deceze, Sep 07 '15 at 07:56
@deceze They were my thoughts as well hence the question. Rep said they had no idea why and that the response was from the ops team. I was hoping someone else with rackspace cloud site hosting could replicate the issue and perhaps someone else may have a reason why. — Pollywaffle, Sep 07 '15 at 09:41
That is nuts. I’ve never heard anything like that before. How do you disable a specific language feature? — Martin Bean, Sep 07 '15 at 12:45

score 2 · Accepted Answer · answered Sep 08 '15 at 14:35

2

After some discussions with rackspace support it seems the issue is with xcache and execution of some items such as traits. Adding the following line to .htaccess resolves the issue:

php_flag xcache.cacher 0

Seems it is not a rackspace issue but an xcache issue.

answered Sep 08 '15 at 14:35

Pollywaffle

71
5

Can you ask what was the problem? – Joako-stackoverflow Sep 09 '15 at 12:35
They are currently running XCache 2.0.1 and I would suggest this is [the bug](http://xcache.lighttpd.net/ticket/295) which is causing the issue. It's been fixed but it's not in the version they are using. – Pollywaffle Sep 14 '15 at 22:47

score 0 · Answer 2 · answered Sep 07 '15 at 12:43

0

Php traits cannot be disabled. If you have a limited use of traits, you could comment out the "use" statements.

answered Sep 07 '15 at 12:43

Joako-stackoverflow

506
1
6
16

It's more that I am using packages that use traits so it's not really an option to modify the code. Interestingly it will run fine up until you call a method that is implemented via a trait. – Pollywaffle Sep 08 '15 at 06:57

Can PHP Traits be disabled in 5.4.x?

2 Answers2