Description:
------------
It would be nice if PHP could allow you to use the [] operator to index 
within an expression that evaluates to an array, as if it was a 
variable.

This feature request is similar to #41268 "Access array member without 
variable", but suggests using the existing [] operator rather than 
adding a new function. I could not find further details on php-internals 
about this issue.

Reproduce code:
---------------
For example:

  $lines = split("\n", $text)
  print $lines[0]

cannot currently be written as

   print split("\n", $text)[0]

nor

   print (split("\n", $text))[0]

Expected result:
----------------
The second and third examples behave identically to the first.

Actual result:
--------------
Parse error: syntax error, unexpected '[' in - on line 2