Description:
------------
unfortunately preg_replace_callback does not handle named groups


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

$a = "bla blub blah";

$regex = '|(?P<name>blub)|';

function callback($match) { var_dump($match); return '-'; }

preg_replace_callback($regex,'callback',$a);

$m = array(); preg_match($regex,$a,$m); var_dump($m);

?>

Expected result:
----------------
array(3) {
  [0]=>
  string(4) "blub"
  ["name"]=>
  string(4) "blub"
  [1]=>
  string(4) "blub"
}
array(3) {
  [0]=>
  string(4) "blub"
  ["name"]=>
  string(4) "blub"
  [1]=>
  string(4) "blub"
}


Actual result:
--------------
array(2) {
  [0]=>
  string(4) "blub"
  [1]=>
  string(4) "blub"
}
array(3) {
  [0]=>
  string(4) "blub"
  ["name"]=>
  string(4) "blub"
  [1]=>
  string(4) "blub"
}