How to use call_user_func for static class method?

Question

The following code works fine.

LibraryTests::TestGetServer();

Get the array of functions in LibraryTests and run them:

$methods = get_class_methods('LibraryTests');
foreach ($methods as $method) {
  call_user_func('LibraryTests::' . $method . '()' );
}

This throws an error: Warning: call_user_func(LibraryTests::TestGetServer()) [function.call-user-func]: First argument is expected to be a valid callback

Here is the class that is being called:

class LibraryTests extends TestUnit {

    function TestGetServer() {
        TestUnit::AssertEqual(GetServer(), "localhost/");
    }
    .
    .
    .

How to fix?

Working in PHP 5.2.8.

Solution

Either (as of PHP 5.2.3):

$methods = get_class_methods('LibraryTests');
foreach ($methods as $method) {
  call_user_func('LibraryTests::' . $method);
}

Or (earlier):

$methods = get_class_methods('LibraryTests');
foreach ($methods as $method) {
  call_user_func(array('LibraryTests', $method));
}

See call_user_func^­Docs and the Callback Pseudo-Type^­Docs.

Comments

[hakre]

Well you need to have a valid callback for that to work. If you put invalid values into $method, it does not work. If you put valid values in there, it does work. Take care that this is for static class methods only.

[B Seven]

Both throw ... [function.call-user-func]: First argument is expected to be a valid callback in ...

[hakre]

Well, first of all define the mehtod as static in your class: static function TestGetServer - or work on a class instance with the array notation. I linked two pages from the manual which contain a lot of information and examples and should lead you the way so that you can solve the problem in whichever way suits your needs.

[B Seven]

OK, that worked. It needs static before function TestGetServer() in class LibraryTests. Thanks.