PHP Manual: Rename an old mailbox to new mailbox

bool imap_renamemailbox(IMAP\Connection $imap, string $from, string $to)

This function renames on old mailbox to new mailbox (see imap_open for the format of mbox names).

imap: An IMAP\Connection instance.
from: The old mailbox name, see imap_open for more information

Warning
Passing untrusted data to this parameter is insecure, unless imap.enable_insecure_rsh is disabled.
to: The new mailbox name, see imap_open for more information

Warning
Passing untrusted data to this parameter is insecure, unless imap.enable_insecure_rsh is disabled.

Returns true on success or false on failure.

Version	Description
8.1.0	The `imap` parameter expects an IMAP\Connection instance now; previously, a valid `imap` resource was expected.

imap_renamemailbox