unix://
and udg://
.
unix:///tmp/mysock
udg:///tmp/mysock
unix://
provides access to a socket stream connection in the Unix domain. udg://
provides an alternate transport to a Unix domain socket using the user datagram protocol.
Unix domain sockets, unlike Internet domain sockets, do not expect a port number. In the case of fsockopen() the portno
parameter should be set to 0.
Note: Unix domain sockets are not supported on Windows.