PHP imap_ping function

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imap_ping

(PHP 3, PHP 4, PHP 5)

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 stream returned by
imap_open().

Returns TRUE if the stream is still alive, FALSE otherwise.

Example 1. imap_ping() Example

 
$imap = imap_open("{imap.example.org}", "mailadmin", "password");
 
// after some sleeping
if (!imap_ping($imap)) {
    // do some stuff to reconnect
}