Description:
------------
Accessing booleans, integers and resources with an array index returns NULL but emits no warning/notice of a potential error.

Tested with

$ sapi/cli/php -v
PHP 7.0.0-dev (cli) (built: Feb  8 2015 01:14:57)
Copyright (c) 1997-2015 The PHP Group
Zend Engine v3.0.0-dev, Copyright (c) 1998-2015 Zend Technologies

I made up the notice messages in "Expected result" to put emphasis what I would have expected.

Similar report: https://bugs.php.net/bug.php?id=44821 , categorized as documentation problem which doesn't sound right.

Test script:
---------------
<?php
$a = false;
$b = $a['index'];
var_dump($b);

$a = 1;
$b = $a['index'];
var_dump($b);

$a = 1.1;
$b = $a['index'];
var_dump($b);

$a = NULL;
$b = $a['index'];
var_dump($b);

$a = fopen($argv[0], 'r');
$b = $a['index'];
var_dump($b);


Expected result:
----------------
Notice: Illegal array access on boolean in Command line code on line 1
NULL
Notice: Illegal array access on integer in Command line code on line 1
NULL
Notice: Illegal array access on double in Command line code on line 1
NULL
Notice: Illegal array access on NULL in Command line code on line 1
NULL
Notice: Illegal array access on resource in Command line code on line 1
NULL

Actual result:
--------------
NULL
NULL
NULL
NULL
NULL