Interface to an user event loop implementation for http\Client::configure()'s $use_eventloop option.
-> ***NOTE:***
+> ***NOTE:***
> This interface was added in v2.6.0, resp. v3.1.0.
## Constants:
-* POLL_NONE
+* POLL_NONE
No action.
-* POLL_IN
+* POLL_IN
Poll for read readiness.
-* POLL_OUT
+* POLL_OUT
Poll for write readiness.
-* POLL_INOUT
+* POLL_INOUT
Poll for read/write readiness.
-* POLL_REMOVE
+* POLL_REMOVE
Stop polling for activity on this descriptor.