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<?php function a(int &$v){ call_user_func_array('b',func_get_args()); } function b(int &$v){ $v=9; } $v=0; a($v); var_dump($v);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
Warning: b(): Argument #1 ($v) must be passed by reference, value given in /in/4IhEq on line 3 int(0)
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: Parameter 1 to b() expected to be a reference, value given in /in/4IhEq on line 3 int(0)
Output for 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.30
Catchable fatal error: Argument 1 passed to a() must be an instance of int, integer given, called in /in/4IhEq on line 9 and defined in /in/4IhEq on line 2
Process exited with code 255.
Output for 5.1.0 - 5.1.6
Fatal error: Argument 1 passed to a() must be an object of class int, called in /in/4IhEq on line 9 and defined in /in/4IhEq on line 2
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Fatal error: Argument 1 must be an object of class int in /in/4IhEq on line 2
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting ')' in /in/4IhEq on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting ')' in /in/4IhEq on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/4IhEq on line 2
Process exited with code 255.

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