What do we call these strings and how they can be decoded? as I found these are UTF-8 multi-byte characters and somewhere I noticed they are UTF-32
\x4c\x4f\x42\x41\x4c\x53
The following sequence of bytes \x4c\x4f\x42\x41\x4c\x53 is an ASCII safe sequence. So you can either treat it as a single byte encoding string, or UTF-8.
$s = "\x4c\x4f\x42\x41\x4c\x53";
echo $s; // outputs LOBALS