imap_sort Sort an array of message headers arrayimap_sort resourcestream intcriteria intreverse intoptions stringsearch_criteria Returns an array of message numbers sorted by the given parameters. Reverse is 1 for reverse-sorting. Criteria can be one (and only one) of the following: SORTDATE message Date SORTARRIVAL arrival date SORTFROM mailbox in first From address SORTSUBJECT message Subject SORTTO mailbox in first To address SORTCC mailbox in first cc address SORTSIZE size of message in octets The flags are a bitmask of one or more of the following: SE_UID Return UIDs instead of sequence numbers SE_NOPREFETCH Don't prefetch searched messages.