PHP call_user_func on a static method

Question

I am developing on Symfony2 and I need to call a method on a class, both known only at runtime.

I have already successfully used variable functions and call_user_func in the project, but this time they give me problems...

My code looks like this

namespace MyBundleNamespace;

use MyBundle\Some\Class;

class MyClass
{
    public static function myFunction() { ... }
}

and in some other file I need to do this

MyClass::myFunction();

but dynamically, so I tried both

$class = "MyClass";
$method = "myFunction";

$class::$method();

and

$class = "MyClass";
$method = "myFunction";
call_user_func("$class::$method");

But I get a class MyClass not found error. Of course the class is included correctly with use and if I call MyClass::myFunction() just like that it works.

I also tried to trigger the autoloader manually like suggested in this question answer comment, but it did not work. Also, class_exists returned false.

What am I missing? Any ideas?

Thanks!

Have you tried call_user_func(array($class, $method));?

prehfeldt
– prehfeldt

2012-05-10 12:55:18 +00:00
Commented May 10, 2012 at 12:55 — prehfeldt
– prehfeldt, Commented May 10, 2012 at 12:55
Yes I did, result was the same.

mokagio
– mokagio

2012-05-10 13:39:36 +00:00
Commented May 10, 2012 at 13:39 — mokagio
– mokagio, Commented May 10, 2012 at 13:39

Jakub Zalas · Accepted Answer · 2012-05-10 13:12:40Z

29

You're missing the namespace:

$class = '\\MyBundleNamespace\\MyClass';
$method = 'myFunction';

Both calls should work:

call_user_func("$class::$method");
call_user_func(array($class, $method));

answered May 10, 2012 at 13:12

Jakub Zalas

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5 Comments

mokagio Over a year ago

Yeah it worked! I prefer the variable function way so I used: $namespace = "MyNamespace"; $class = "$namespace\\MyClass"; $method = "myMethod"; $class::$myMethod();

mokagio Over a year ago

Could you please tell me why I had to add the namespace? Is it related to the fact that the whole thing is evaluated runtime?

Jakub Zalas Over a year ago

Sure. If you don't specify the namespace (or import it with "use") current one is used.

mokagio Over a year ago

Well I know that, but the use MyNameSpace\MyClass; was already in the file...

Darvanen Dec 20, 2024 at 3:19

The string gets passed to the global namespace. call_user_func doesn't have access to the use statement in the place it was called from

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