stream_select fails on blocking sockets except for incoming connections

[R3kyr]

stream_select fails on blocking sockets except for incoming connections

[nielsdos]

stream_select modifies the array passed as an argument.

See https://www.php.net/manual/en/function.stream-select which says:

Note:

When stream_select() returns, the arrays read, write and except are modified to indicate which stream resource(s) actually changed status. The original keys of the arrays are preserved.

You can observe this by adding a var_dump inside your while loop.
The first iteration works, but the second one has cleared out the arrays, so the second call to stream_select fails because the arrays are empty.
If you change the last while loop to this, it seems to work:

while(!stream_select($read, $read, $read, 0)) {
    var_dump($read, count($read));
    $read = [$server];
    usleep(1000);
}

So as far as I can tell, this issue is about a misunderstanding of how stream_select works. Does this help you, or am I missing something?

[R3kyr]

Oh my god, I've been so blind... Yes, you're absolutely right! I should've checked the docs more precisely... So it was a simple race condtion all the time. Sorry for this unnecessary ticket.