--TEST-- Testing operations with undefined variable --FILE-- <?php var_dump($a[1]); var_dump($a[$c]); var_dump($a + 1); var_dump($a + $b); var_dump($a++); var_dump(++$b); var_dump($a->$b); var_dump($a->$b); var_dump($a->$b->$c[1]); ?> --EXPECTF-- Notice: Undefined variable: a in %s on line %d NULL Notice: Undefined variable: %s in %s on line %d Notice: Undefined variable: %s in %s on line %d NULL Notice: Undefined variable: a in %s on line %d int(1) Notice: Undefined variable: %s in %s on line %d Notice: Undefined variable: %s in %s on line %d int(0) Notice: Undefined variable: a in %s on line %d NULL Notice: Undefined variable: b in %s on line %d int(1) Notice: Trying to get property of non-object in %s on line %d NULL Notice: Trying to get property of non-object in %s on line %d NULL Notice: Undefined variable: c in %s on line %d Notice: Trying to get property of non-object in %s on line %d Notice: Trying to get property of non-object in %s on line %d NULL