(PHP 4, PHP 5, PHP 7)
imap_deletemailbox — Delete a mailbox
imap_deletemailbox ( resource $imap_stream , string $mailbox ) : bool
 Deletes the specified mailbox. 
imap_stream
An IMAP stream returned by imap_open().
mailbox
The mailbox name, see imap_open() for more information
Passing untrusted data to this parameter is insecure, unless imap.enable_insecure_rsh is disabled.
 Returns true on success or false on failure. 
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    https://www.php.net/manual/en/function.imap-deletemailbox.php