I was trying to use PHP to talk to Xdebug's new out-of-band control sockets, which use the abstract Unix domain socket namespace (socket names starting with a \0 character).

Xdebug uses names that are the maximum allowed length for these socket names (108 bytes).

However, when I tried to run:

<?php
$name = "\0xdebug-ctrl.2078073yxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
echo strlen($name), "\n";
$f = stream_socket_client("unix://$name");

I got the following output and error:

108

Notice: stream_socket_client(): socket path exceeded the maximum allowed length of 108 bytes and was truncated in Standard input code on line 2

But the path is exactly 108 characters, not more. It turned out that the check for this maximum length is wrong.

No new test can easily be created, as the 108 is implementation specific, and ext/standard/tests/streams/bug60106.phpt already covers it.

With this change, I can now correctly connection to these sockets.