(no version information, might be only in CVS)
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.
注: 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.
注: This function treats path in 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.