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<?php class Testme { public static function foo(&$ref) { $ref = 1; } } class Invoker { public static function invoke($func_name) { $args = func_get_args_byref(); $ref = &array_slice($args,1); call_user_func_array(array('Testme', $func_name), $ref); } } function func_get_args_byref() { $trace = debug_backtrace(); return $trace[1]['args']; } $test = 2; $testRef = &$test; Invoker::invoke('foo', $testRef); var_dump($test);
Output for 7.0.0 - 7.1.0
Notice: Only variables should be assigned by reference in /in/N2Jd7 on line 11 Warning: Parameter 1 to Testme::foo() expected to be a reference, value given in /in/N2Jd7 on line 12 int(2)
Output for hhvm-3.10.0 - 3.12.0
Warning: Parameter 1 to Testme::foo() expected to be a reference, value given in /in/N2Jd7 on line 12 int(2)
Output for 5.0.5 - 5.6.28
Strict Standards: Only variables should be assigned by reference in /in/N2Jd7 on line 11 int(2)
Output for 5.0.0 - 5.0.4
int(2)
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/N2Jd7 on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/N2Jd7 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/N2Jd7 on line 3
Process exited with code 255.