Using $this in method called with call_user_func_array

array("Foo", "bar") is equal to Foo::bar(), i.e. a static method - this makes sense since $foo is nowhere used and thus PHP cannot know which instance to use.

What you want is array($foo, "bar") to call the instance method.

See http://php.net/manual/en/language.types.callable.php for a list of the various callables.

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You also need to pass the arguments as an indexed array instead of an associative array, i.e. array(1) instead of array('id' => 1)