STREAM_SERVER_LISTEN

STREAM_SERVER_LISTEN is one of the accepted parameters for stream_socket_server parameter #4 (optionally as a bitmask).

STREAM_SERVER_LISTEN — Indicates that a stream bound using STREAM_SERVER_BIND flag to start listening to the socket. Connection-orientated transports (such as TCP) must use this flag, otherwise the server socket will not be enabled. Using this flag for connect-less transports (such as UDP) is an error.

STREAM_SERVER_LISTEN = 8;