参数

cb

The new callback for new connections. Ignored if null.

Should match the following prototype:

callback(
     EventListener $listener = null ,
     mixed $fd = null ,
     array $address = null ,
     mixed $arg = null
): void

listener

The EventListener object.

fd

The file descriptor or a resource associated with the listener.

address

Array of two elements: IP address and the server port.

arg

User custom data attached to the callback.

arg

Custom user data attached to the callback. Ignored if null.