MongoDB has built-in support for via Unix Domain Sockets and will open the socket on startup, by default located in /tmp/mongodb-<port>.sock..
To connect to the socket file, specify the path in your MongoDB connection string:
$m = new MongoClient("mongodb:///tmp/mongo-27017.sock");
If you would like to authenticate against a database (as described above) with a socket file, you must specify a port of 0 so that the connection string parser can detect the end of the socket path. Alternatively, you can use the constructor options.
$m = new MongoClient("mongodb://username:password@/tmp/mongo-27017.sock:0/foo");
|1.0.9||Added support for Unix Domain Sockets.|