php_stream_sock_open_unix() attempts to open the Unix domain socket
specified by path. pathlen specifies the
length of path.
If timeout is not NULL, it specifies a timeout period for the connection attempt.
persistent indicates if the stream should be opened as a persistent
stream. Generally speaking, this parameter will usually be 0.
Note: This function will not work under Windows, which does not implement Unix domain sockets. A possible exception to this rule is if your PHP binary was built using cygwin. You are encouraged to consider this aspect of the portability of your extension before it's release.
Note: This function treats
pathin a binary safe manner, suitable for use on systems with an abstract namespace (such as Linux), where the first character of path is a NUL character.