Warning: byref_function(): Argument #1 ($a) must be passed by reference, value given in /in/cCFs0 on line 9
Warning: byref_function(): Argument #2 ($b) must be passed by reference, value given in /in/cCFs0 on line 9
Warning: Parameter 1 to byref_function() expected to be a reference, value given in /in/cCFs0 on line 9
Warning: Parameter 2 to byref_function() expected to be a reference, value given in /in/cCFs0 on line 9