imap_ping pings the stream to see if it's still active. It may discover new mail; this is the preferred method for a periodic "new mail check" as well as a "keep alive" for servers which have inactivity timeout.
An IMAP\Connection instance.
Returns true if the stream is still alive, false otherwise.
|8.1.0||The imap parameter expects an IMAP\Connection instance now; previously, a resource was expected.|