问题
I have PHP script that fetch messages from a mailbox. I use the imap_search function:
$emails = imap_search($mbox, 'UNSEEN');
Is there a way to limit the number of returned messages. Right now on huge mailboxes i get like 5000 messages. I want only the top 20 ordered by date.
Is there a way to do that?
Thanks.
回答1:
The imap_search function has a CRITERIA attribute you can use to limit the messages in a number of ways:
ALL - return all messages matching the rest of the criteria
ANSWERED - match messages with the \ANSWERED flag set
BCC "string" - match messages with "string" in the Bcc: field
BEFORE "date" - match messages with Date: before "date"
BODY "string" - match messages with "string" in the body of the message
CC "string" - match messages with "string" in the Cc: field
DELETED - match deleted messages
FLAGGED - match messages with the \FLAGGED (sometimes referred to as Important or Urgent) flag set
FROM "string" - match messages with "string" in the From: field
KEYWORD "string" - match messages with "string" as a keyword
NEW - match new messages
OLD - match old messages
ON "date" - match messages with Date: matching "date"
RECENT - match messages with the \RECENT flag set
SEEN - match messages that have been read (the \SEEN flag is set)
SINCE "date" - match messages with Date: after "date"
SUBJECT "string" - match messages with "string" in the Subject:
TEXT "string" - match messages with text "string"
TO "string" - match messages with "string" in the To :
UNANSWERED - match messages that have not been answered
UNDELETED - match messages that are not deleted
UNFLAGGED - match messages that are not flagged
UNKEYWORD "string" - match messages that do not have the keyword "string"
UNSEEN - match messages which have not been read yet
回答2:
imap_sort will allow you to both sort and filter at the same time
But still, it won't allow to limit to the 'top 20' right at the function call.
回答3:
imap_search docs indicate this function:
Returns an array of message numbers or UIDs.
imap_fetch_overview docs indicate this function also returns:
message_id - Message-ID, uid - UID the message has in the mailbox
So we can use the imap_fetch_overview and sort a certain number and order with the same return as the imap_search function.
// get information about the current mailbox
$mboxCheck = imap_check($mbox);
// get the total amount of messages
$totalMessages = $mboxCheck->Nmsgs;
// select how many messages you want to see
$showMessages = 20;
// get those messages
$result = imap_fetch_overview($mbox($totalMessages-$showMessages+1).":".$totalMessages);
$n = 0;
$emails = array();
// loop through returned messages, collect message numbers in same format as output of imap_search
foreach ($result as $mail) {
$emails[$n] = $mail->msgno;
$n++;
}
if($emails) {
// put the newest emails on top
rsort($emails);
}
This is built with the concept from this answer
回答4:
To solve this problem by so:
1.You could limit the no of result returned by reducing the no of data using the since criteria 2. Retreive few last returned messages e.g 15
$this->msgCounts = imap_search($imap_resource, 'SUBJECT "hello dolly" SINCE "8 April 2003"', SE_UID);
And then here is an example to retreive the last 15 returned and then toggle forward and backward to view more results or older.Note this assumes you have a button forward and older that set $_GET variables.
$this->msgCounts = $messageCounts;
$multiarray=[];
\Session::put('totalmsg',$this->msgCounts); //Sav etotal no of message in folder to session to determine if to allow next or previous
if($this->msgCounts > 15) //MESSAGES IS MORE THAN WE NEED GET 20
{
$offcut = 15; //default offcut
/**
* Viewing previous or next messages
**/
if(isset($_GET['msgs']) && $_GET['msgs'] == 'older')
{
$this->msgCounts = \Cache::has('msgpointer') ? \Cache::get('msgpointer') : $this->msgCounts;
$msgOffset = $this->msgCounts - $offcut; //get +15 messages
if($offcut > $msgOffset) {
$msgOffset = $msgOffset + 5; //if less than 15 get 10
$offcut = 10;
}
if($offcut > $msgOffset) {
$msgOffset = $msgOffset + 5; //if less than 10 get 5
$offcut = 5;
}
if($offcut > $msgOffset) {
$msgOffset = $msgOffset + 3; //if less than 3 get 2
$offcut = 2;
}
if($offcut > $msgOffset) {
$msgOffset = $msgOffset + 2; //if less than 2 get 1
$offcut = 1;
}
\Cache::put('msgpointer',$msgOffset,60 * 60 * 24);
}
if(isset($_GET['msgs']) && $_GET['msgs'] == 'newest')
{
$this->msgCounts = \Cache::has('msgpointer') ? \Cache::get('msgpointer') : $this->msgCounts;
$msgOffset = $this->msgCounts + $offcut; //get +15 messages
if($msgOffset > $messageCounts) {
$msgOffset = $msgOffset - 5; //if not up to 15 get 10
$offcut = 10;
}
if($msgOffset > $messageCounts) {
$msgOffset = $msgOffset - 5; //if not up to 10 get 5
$offcut = 5;
}
if($msgOffset > $messageCounts) {
$msgOffset = $msgOffset - 3; //if not up to 5 get 2
$offcut = 2;
}
if($msgOffset > $messageCounts) {
$msgOffset = $msgOffset - 2; //if not up to 2 get 1
$offcut = 1;
}
\Cache::put('msgpointer',$msgOffset,60 * 60 * 24);
}
// LOOP THROUGH LAST 20 MESSAGES IF THERE MORE THAN 10 MESSAGES
for ($i = $this->msgCounts; $i > $this->msgCounts - $offcut; $i--)
{
$header = imap_header($this->conn,$i); //GET HEADER INFO USING IMAP FUNCTION
$uid = imap_uid($this->conn,$i); //GET UNIQUE MESSAGE ID FOR READING MESSAGE LATER
//SAVE ALL MESSAGE INFO IN ARRAY
$tobox = $header->reply_to[0]->mailbox ? $header->reply_to[0]->mailbox : 'noreply';
$tohost = $header->reply_to[0]->mailbox ? $header->reply_to[0]->host : 'email.com';
$toaddress = $tobox.'@'.$tohost;
$mailbox = isset($header->from[0]->mailbox) ? $header->from[0]->mailbox : 'no-reply';
$host = isset($header->from[0]->host) ? $header->from[0]->host : 'email.com';
$fromaddress = $mailbox.'@'.$host;
$array = ['toaddress' => isset($header->toaddress) ? $header->toaddress : isset($header->to) ? $header->to[0]->mailbox.'@'.$header->to[0]->host : $toaddress,'date' => isset($header->date) ? $header->date : date('Y-m-d'),'subject' => isset($header->subject) ? $header->subject : "no subject" ,'from' => isset($header->from[0]->personal) ? $header->from[0]->personal :$fromaddress,'unseen' => isset($header->Unseen) ? $header->Unseen : 'S', 'uid' => isset($uid) ? $uid : $i,'fromemail' => $fromaddress];
//PASS A MESSAGE INFO INTO A MULTI ARRAY
$multiarray[] = $array;
}
You could set the date it get from to be 90 days before then if its a lot.return it chunk by chunk like above.My apologies for using some laravel helper classes there,all is well commented out. Hope this helps someone!
来源：https://stackoverflow.com/questions/2177306/imap-search-limit-the-number-of-messages-returned