Note to the future myself:
Callbacks to object methods in PHP are made by:
call_user_func(array($object_reference, 'method_name'));
Examples:
call_user_func(array($this, 'doSomething')); // in the current object's scope
call_user_func(array('MyClass', 'doSomething')); // anywhere
call_user_func('MyClass::doSomething'); // As of PHP 5.2.3
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Tags: php