Why does the error “expected to be a reference, value given” appear?

Question

It fires out when I try to call function with argument by reference

function test(&$a) ...

through

call_user_func(\'tes         


        

Answer 1

From the manual for call_user_func()

Note that the parameters for call_user_func() are not passed by reference.

So yea, there is your answer. However, there is a way around it, again reading through the manual

call_user_func_array('test', array(&$b));

Should be able to pass it by reference.