(PHP 4, PHP 5, PHP 7, PHP 8)
imap_sort — Gets and sort messages
$imap,$criteria,$reverse,$flags = 0,$search_criteria = null,$charset = nullGets and sorts message numbers by the given parameters.
imapIMAP\Connection 实例。
criteriaCriteria 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
         
        reverseWhether to sort in reverse order.
flags
       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
         
        search_criteriaIMAP2-format search criteria string. For details see imap_search().
charsetMIME character set to use when sorting strings.
   Returns an array of message numbers sorted by the given
   parameters,  或者在失败时返回 false.
  
| 版本 | 说明 | 
|---|---|
| 8.1.0 | 现在 imap参数接受 IMAP\Connection
  实例,之前接受 资源(resource)。 | 
| 8.0.0 | reverseis now bool instead of int. | 
| 8.0.0 | search_criteriaandcharsetare now nullable. |