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<?php function do_action_ref_array( $callback, $args ) { var_dump($args); //$args[0] = 'b'; call_user_func_array( $callback, array_slice( $args, 0, 2 ) ); } function filter( $arg1, &$arg2 ) { var_dump( $arg1, $arg2 ); return $arg1; }; class Test { public function run() { do_action_ref_array( 'filter', [1, &$this] ); } } $object = new Test(); $object->run();
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> int(1) [1]=> object(Test)#1 (0) { } } int(1) object(Test)#1 (0) { }

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