Description:
------------
When using preg_match_all with named capture groups, the result array will contain one entry with a numeric key in addition to one entry with the name of the group. Assuming I put the named capture group there on purpose, there is no reason why I would need the numeric index. It only bloats the result array.

As a user I would like to have an option that returns the results without the superfluous numeric index. 

Test script:
---------------
<?php

preg_match_all(
    '/This message contains (?<items>[\d]+) items/',
    'This message contains 42 items',
    $matches
);
print_r($matches);

Expected result:
----------------
Array
(
    [0] => Array
        (
            [0] => This message contains 42 items
        )

    [items] => Array
        (
            [0] => 42
        )
)

Actual result:
--------------
Array
(
    [0] => Array
        (
            [0] => This message contains 42 items
        )

    [items] => Array
        (
            [0] => 42
        )

    [1] => Array
        (
            [0] => 42
        )
)