imap_sort

(PHP 4, PHP 5, PHP 7, PHP 8)

imap_sort — Gets and sort messages

说明

imap_sort ( resource $imap , int $criteria , bool $reverse , int $flags = 0 , string|null $search_criteria = null , string|null $charset = null ) : array|false

Gets and sorts message numbers by the given parameters.

参数

imap

由 imap_open() 返回的 IMAP 流。

criteria

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

reverse

Whether 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_criteria

IMAP2-format search criteria string. For details see imap_search().

charset

MIME character set to use when sorting strings.

返回值

Returns an array of message numbers sorted by the given parameters, 或者在失败时返回 false.

更新日志

版本	说明
8.0.0	`reverse` is now bool instead of int.
8.0.0	`search_criteria` and `charset` are now nullable.

User Contributed Notes

antoine dot spam-nono at maxg dot info 09-Feb-2006 07:42


I worked a lot with IMAP functions since I wrote a complete webmail and I've got a little tip about the imap_sort function :



There is a big difference between :



<?php

 imap_sort($imap, SORTDATE, 1);

// and 

 imap_sort($imap, SORTARRIVAL, 1);

?>



The first command will issue a

 >> FETCH 1:last (UID ENVELOPE BODY.PEEK[HEADER.FIELDS (Newsgroups Content-MD5 Content-Disposition Content-Language Content-Location Followup-To References)] INTERNALDATE RFC822.SIZE FLAGS)



While the second resulted in

 >> FETCH 1:last (UID INTERNALDATE RFC822.SIZE FLAGS)



As a result, using SORTDATE took 3 seconds longer to complete on a 800-emails mailbox, while the results are quite the same (except if you have to deal with forged dates or timezones, but the arrival order is far more logical)



My advice if you sort your emails by arrival is to actually use SORTARRIVAL, or better don't use imap_sort and go straight with message numbers (not UIDs). On large mailboxes, if you display messages per page, you will have significant performance increases (by avoiding 5 seconds of sorting).

persian-horde at metanetworking dot com 07-May-2005 09:41


Hello,

We used MIME and NLS libraries in our previous code(imap_locale_sort) that

are part of PEAR and Horde projects, and so our function

was so specific. Here is the general (pure php) code for this

function:



function imap_locale_sort($stream,$criteria,$reverse,$locale,$options)

{

        if ($criteria!=SORTSUBJECT)

                return (imap_sort($stream,$criteria,$reverse,$options));



        $unsorted = array();

        $sortresult = array();



        $MC=imap_check($stream);

        $MN=$MC->Nmsgs;



        $overview = imap_fetch_overview($stream,"1:$MN",0);

        $k=0;

        while( list($key,$val) = each($overview))

        {

                $unsorted[$k]["uid"]=$val->uid;

                $unsorted[$k]["subject"]=imap_utf8($val->subject);

                $k++;

        }

        usort ($unsorted, create_function('$a,$b','setlocale(LC_ALL,$locale);return strcoll($a["subject"],$b["subject"]);'));



        for ($m=0;$m<count($unsorted);$m++)

                array_push($sortresult,$unsorted[$m]["uid"]);



        if ($reverse)

                $sortresult = array_reverse($sortresult);



        return $sortresult;

}



Sample usage:



$mbox = imap_open("{localhost:143}INBOX.sent-mail","userid","password");



if ($mbox)

    echo ("Connection Successful!");



$sorted = imap_locale_sort($mbox,SORTSUBJECT,0,'fa_IR',0);

print_r($sorted);

print ("\n\n");

$sorted = imap_sort($mbox,SORTSUBJECT,SE_UID);

print_r($sorted);



imap_close($mbox);

persian-horde at metanetworking dot com 07-May-2005 03:17


imap_sort uses the c-client library to sort messages. This library currently does not 

support locale-based sort for foreign languages (Although it has charset option).

They are working on this(http://www.washington.edu/imap/IMAP-FAQs/#1.12),

but you can use the following function which uses strcoll() for locale-based sorting.

Pease note that this is required for SUBJECT field sorting, because most of 

other fields are sorted correctly by imap_sort in any locale:



function imap_locale_sort($stream,$criteria,$reverse,$locale,$options)

{

        if ($criteria!=SORTSUBJECT)

                return (imap_sort($stream,$criteria,$reverse,$options));



        $unsorted = array();

        $sortresult = array();



        $MC=imap_check($stream);

        $MN=$MC->Nmsgs;



        $overview = imap_fetch_overview($stream,"1:$MN",0);

        $k=0;

        while( list($key,$val) = each($overview))

        {

                $unsorted[$k]["uid"]=$val->uid;

                $unsorted[$k]["subject"]=MIME::decode($val->subject, NLS::getCharset());

                $k++;

        }

        usort ($unsorted, create_function('$a,$b','setlocale(LC_ALL,$locale);return strcoll($a["subject"],$b["subject"]);'));



        for ($m=0;$m<count($unsorted);$m++)

                array_push($sortresult,$unsorted[$m]["uid"]);



        if ($reverse)

                $sortresult = array_reverse($sortresult);



        return $sortresult;

}



Usage example:



$sorted = imap_locale_sort($stream,SORTSUBJECT,0,'fa_IR',0);

boscolau at mac dot com 22-Mar-2005 02:57


in reply to graham_NOSPAM at rdb-concepts dot NOSPAM dot co dot uk here is a more elegant way to achieve sorting of search results:



function order_search($searchresults, $sortresults) {

    return array_values(array_intersect($sortresults,$searchresults));

}



example of using function:

   $sortresults = imap_sort($stream, $sort, $sortorder);

   $searchresults = imap_search($stream, $query);

   $sorted_search_results = order_search($searchresults, $sortresults);



sorted version of search results will then be held in the array of $sorted_search_results.

tilmauder at yahoo dot com 27-Apr-2004 09:43


in response to fprado's problem, the solution would be to use array_multisort() function on imap_fetchheader(). sdavey at datalink dot net dot au wrote an excellent example under array_multisort. I have used it to sort POP3 by message size. Unfortunately, my code is much too convoluted to post it here.

fprado at pmovil dot com dot br 21-Nov-2002 01:23


I use imap_sort() to go through POP3 accounts. However, sometimes, when the mailbox is too large, the response is incredibly slow.



I tried sniffing the network to discover the source of the problem and found that when imap_sort() is called for a POP3 server, it downloads the full body & attachs of ALL the messages in the mailbox. Since my POP server and my Web server are on differente machines, this caused the considerably slow response.



I've been trying a work-around this issue and if I manage to do this I'll post it here.

graham_NOSPAM at rdb-concepts dot NOSPAM dot co dot uk 18-Feb-2002 01:34


for those of you with an old version of PHP that doesn't support the extra search paramater you may want to use this function:

function order_search($searchresults, $sortresults) {

    $searchhash = array();

    $returnresults = array();

    $count = 0;

    for ($i = 0; $i < sizeof($searchresults); $i++) {

        $searchhash[$searchresults[$i]] = true;

    }

    for ($i = 0; $i < sizeof($sortresults); $i++) {

        if (@$searchhash[$sortresults[$i]]) {

            $returnresults[$count] = $sortresults[$i];

            $count++;

        }

    }

    return $returnresults;

}



example of using function:

    $sortresults = imap_sort($stream, $sort, $sortdir, SE_UID);

    $searchresults = imap_search($stream, $search, SE_UID);

    $results = order_search($searchresults, $sortresults);



$results will then hold a sorted array of search results.