Description:
------------
I expected that I can split any string to single octects, but it does not work for UTF-8 character C29D

https://3v4l.org/FjUb7

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

$ch = "\xc2\x9d";
foreach (str_split($ch) as $c) {
    echo sprintf("0x%02X", $c) . "\n";
}


Expected result:
----------------
0xC2
0x9D

Actual result:
--------------
0x00
0x00