Description:
------------
An option value containing a constant followed by an quoted string is transformed 
in constant string: CONSTANT "string" => CONSTANT string

This is broken since 5.3.15/5.4.5, probably by fixing 
https://bugs.php.net/bug.php?id=51094

See http://3v4l.org/VkQgF

And INI_SCANNER_RAW isn't really raw, as quotes are removed anyway.
For value = "string" I would expect array('value' => '"string"') as result, so 
one can differentiate between value = "CONSTANT" and value = CONSTANT.

Test script:
---------------
<?php
define('INSTALL_ROOT', "meukee!");

$array = parse_ini_string('
int = 123
constant = INSTALL_ROOT
quotedString = "string"
a = INSTALL_ROOT "waa"
b = "INSTALL_ROOT"
c = "waa" INSTALL_ROOT
d = INSTALL_ROOT "INSTALL_ROOT"', false, INI_SCANNER_RAW);

var_dump($array);

Expected result:
----------------
array(7) {
  ["int"]=>
  string(3) "123"
  ["constant"]=>
  string(12) "INSTALL_ROOT"
  ["quotedString"]=>
  string(6) "string"
  ["a"]=>
  string(16) "INSTALL_ROOT waa"
  ["b"]=>
  string(12) "INSTALL_ROOT"
  ["c"]=>
  string(16) "waa INSTALL_ROOT"
  ["d"]=>
  string(25) "INSTALL_ROOT INSTALL_ROOT"
}

Actual result:
--------------
array(7) {
  ["int"]=>
  string(3) "123"
  ["constant"]=>
  string(12) "INSTALL_ROOT"
  ["quotedString"]=>
  string(6) "string"
  ["a"]=>
  string(18) "INSTALL_ROOT "waa""
  ["b"]=>
  string(12) "INSTALL_ROOT"
  ["c"]=>
  string(18) ""waa" INSTALL_ROOT"
  ["d"]=>
  string(27) "INSTALL_ROOT "INSTALL_ROOT""
}

even better:

array(7) {
  ["int"]=>
  string(3) "123"
  ["constant"]=>
  string(12) "INSTALL_ROOT"
  ["quotedString"]=>
  string(6) ""string""
  ["a"]=>
  string(18) "INSTALL_ROOT "waa""
  ["b"]=>
  string(12) "INSTALL_ROOT"
  ["c"]=>
  string(18) ""waa" INSTALL_ROOT"
  ["d"]=>
  string(27) "INSTALL_ROOT "INSTALL_ROOT""
}