PHP Manual: Clears IMAP cache

true imap_gc(IMAP\Connection $imap, int $flags)

Purges the cache of entries of a specific type.

imap: An IMAP\Connection instance.
flags: Specifies the cache to purge. It may one or a combination of the following constants: IMAP_GC_ELT (message cache elements), IMAP_GC_ENV (envelope and bodies), IMAP_GC_TEXTS (texts).

Always returns true.

Throws a ValueError if flags is invalid.

Version	Description
8.1.0	The `imap` parameter expects an IMAP\Connection instance now; previously, a valid `imap` resource was expected.
8.0.0	A ValueError is now thrown on invalid `flags` parameter values. Previously, a warning was emitted and the function returned `false`.

Example #1 imap_gc example

<?php

$mbox = imap_open("{imap.example.org:143}", "username", "password");

imap_gc($mbox, IMAP_GC_ELT);

?>