Description:
------------
Error reported for invalid [] access seems inconsistent :

echo NULL["bar"] -> Parse error
echo []["bar"]   -> Parse error
$foo = NULL; echo $foo["bar"] -> Fails silently
$foo = [];   echo $foo["bar"] -> Notice: Undefined index
class Bar {} ; $foo = new Bar(); echo $foo["bar"]; -> PHP Fatal error

I whish :
[]["bar"] to trigger Notice: Undefined index
NULL["bar"] to trigger something catcheable with set_error_handler
$foo = NULL; $foo["bar"] to trigger a catcheable Notice.


Test script:
---------------
/usr/local/php-5.4.5/bin/php -r 'error_reporting(-1); echo []["bar"];'
/usr/local/php-5.4.5/bin/php -r 'error_reporting(-1); echo NULL["bar"];'
/usr/local/php-5.4.5/bin/php -r 'error_reporting(-1); $foo = NULL; $foo["bar"];'
/usr/local/php-5.4.5/bin/php -r 'error_reporting(-1); $foo = []; $foo["bar"];'
/usr/local/php-5.4.5/bin/php -r 'error_reporting(-1); class Bar {} ; $foo = new Bar(); echo $foo["bar"];'

Expected result:
----------------
At least get a Notice on :
$foo = NULL;
echo $foo["bar"];


Actual result:
--------------
Fails silently.