Description:
------------
The headers_list() function is not functioning as documented.  The documentation example shows the return value of the function to be a numerically indexed array of headers (name and value).  The return value I am seeing excludes the value portion of the reponse headers (values after the ':').

Reproduce code:
---------------
<?php

/* setcookie() will add a response header on its own */
setcookie('foo', 'bar');

/* Define a custom response header
   This will be ignored by most clients */
header("X-Sample-Test: foo");

/* Specify plain text content in our response */
header('Content-type: text/plain');

/* What headers are going to be sent? */
var_dump(headers_list());

?>

Expected result:
----------------
array(4) {
  [0]=>
  string(29) "X-Powered-By: PHP/5.0.0"
  [1]=>
  string(19) "Set-Cookie: foo=bar"
  [2]=>
  string(18) "X-Sample-Test: foo"
  [3]=>
  string(24) "Content-type: text/plain"
}

Actual result:
--------------
array(4) {
  [0]=>
  string(12) "X-Powered-By"
  [1]=>
  string(10) "Set-Cookie"
  [2]=>
  string(13) "X-Sample-Test"
  [3]=>
  string(12) "Content-type"
}