--TEST--
Const string dereference
--FILE--
<?php
error_reporting(E_ALL);

var_dump("foobar"[3]);
var_dump("foobar"[2][0]);
var_dump("foobar"["0foo"]["0bar"]);
?>
--EXPECTF--
string(1) "b"
string(1) "o"

Warning: Illegal string offset "0foo" in %s on line %d

Warning: Illegal string offset "0bar" in %s on line %d
string(1) "f"