--TEST-- Testing array dereferencing on array returned from __call method --FILE-- x) == 1) { $this->x[] = $y[0]; } return $this->x; } } $foo = new foo; $x = array(1); $foo->b($x)[1] = 3; var_dump($foo->b()[0]); var_dump($foo->b()[1]); var_dump($foo->b()[2]); ?> --EXPECTF-- int(2) array(1) { [0]=> int(1) } Warning: Undefined array key 2 in %s on line %d NULL