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# Unix Domain: Unix and UDG

`unix://` since `PHP 3`, `udg://` since `PHP 5`

- `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.

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