socket_getsockname returns wrong address on some unix filename

[jyxjjj]

Description

The following code:

<?php
        $socket = socket_create(AF_UNIX, SOCK_STREAM, 0);
        socket_bind($socket, 'sn.sock');
        socket_listen($socket);
        socket_getsockname($socket, $address);

Resulted in this output:

sn.sockxxxxxxxx

But I expected this output instead:

sn.sock

There are more binary string when named as sn.sock
(So i will give it all in hex)
something like this in hex: 58b30101
changed every time when re-generate sn.sock: 98f6(strange, this time it only 4 length)

When a.sock: 9098c10301 90d8800101
s.sock: 90186a0301
(changed every time too)

At first i think it is because this string is too short,
Then i tried s.s, it always returned s.s correctly.

I am using 8.3.1 , I haven't done any more testing, but I have the impression that I met this a long time ago, when I was still a newbie. Seems like from PHP5. I don't have such old env, cannot give more test, sorry

PHP Version

8.3.1

Operating System

macOS 14.2.1 23C71