Description:
------------
I want to use preg_split with the u modifier to split a UTF-8 string by each character, like that: preg_split('//u', $txt, -1, PREG_SPLIT_NO_EMPTY);

It works fine, however, there is a bug when the string contains the sequence "\n\t" (0x0A09 in hex): the two characters are NOT splitted (see the example attached).

Note that this bug isn't present when preg_split is used whithout the u modifier.

This bug was reported previously here for version 5.2.4: http://bugs.php.net/bug.php?id=42737, but netherless is *still* present in version 5.2.5 and 5.2.6!

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

        $txt = "abc\n\txyz!";
        $tab = preg_split('//u', $txt, -1, PREG_SPLIT_NO_EMPTY);
        print_r($tab);
        echo '$tab[3]: len = ', strlen($tab[3]), ', hex = ', bin2hex($tab[3]), "\n";
?>


Expected result:
----------------
Array
(
    [0] => a
    [1] => b
    [2] => c
    [3] => 

    [4] => 	
    [5] => x
    [6] => y
    [7] => z
    [8] => !
)
$tab[3]: len = 1, hex = 0a


Actual result:
--------------
$ php test.php
Array
(
    [0] => a
    [1] => b
    [2] => c
    [3] => 
	
    [4] => x
    [5] => y
    [6] => z
    [7] => !
)
$tab[3]: len = 2, hex = 0a09