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<?php function by_ref(&$arg) { $arg = 42; } class ModuleHandler { public function invokeAll($hook, &$args) { by_ref($args[0]); } } $moduleHandler = new ModuleHandler(); $moduleHandler->invokeAll('example', array(23)); $array = array(25); $moduleHandler->invokeAll('example', $array); var_dump($array);

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