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<?php Class A { public function __call($method, $args){ $test = &$args[0]; call_user_func_array([$this, 'test'], $args); } protected function test(&$data) { $data = "done"; } } $data = 42; $a = new A(); $a->test($data); var_dump($data); die();
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 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, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
int(42)

preferences:
189.13 ms | 404 KiB | 227 Q