php教程

imap_fetchheader

(PHP 4, PHP 5, PHP 7)

imap_fetchheader — Returns header for a message

说明

imap_fetchheader ( resource $imap_stream , int $msg_number [, int $options = 0 ] ) : string

This function causes a fetch of the complete, unfiltered » RFC2822 format header of the specified message.

参数

imap_stream

由 imap_open() 返回的 IMAP 流。

msg_number

The message number

options

The possible options are:

  • FT_UID - The msgno argument is a UID
  • FT_INTERNAL - The return string is in "internal" format, without any attempt to canonicalize to CRLF newlines
  • FT_PREFETCHTEXT - The RFC822.TEXT should be pre-fetched at the same time. This avoids an extra RTT on an IMAP connection if a full message text is desired (e.g. in a "save to local file" operation)

返回值

Returns the header of the specified message as a text string.

参见

User Contributed Notes

george dot who at gmail dot com 15-Jun-2015 02:03
Here is a simple function to get an array with all headers.

<?php
function mail_header_parse($mbox,$msg){
    $header=imap_fetchheader($mbox,$msg);
    preg_match_all("/^([^\r\n:]+)\s*[:]\s*([^\r\n:]+(?:[\r]?[\n][ \t][^\r\n]+)*)/m",$header,$matches,PREG_SET_ORDER);
    foreach($matches as $match){
        $match[2]=iconv_mime_decode($match[2],ICONV_MIME_DECODE_CONTINUE_ON_ERROR,'utf-8');
        if(is_array($headers[$match[1]])){
            $headers[$match[1]][]=$match[2];
        }elseif(isset($headers[$match[1]])){
            $headers[$match[1]]=array($headers[$match[1]],$match[2]);
        }else{
            $headers[$match[1]]=$match[2];
        }
    }
    return $headers;
}
?>
rgagnon24 dot nospam at gmail dot com 24-Jun-2010 09:52
Interesting that imap_headerinfo() does not allow a UID for the $msg_number field like all other fetching functions seem to allow.

If you want to use a UID to fetch the headers, use this two-step process:

<?php
/*
 * assumes $mbox is your stream, and $uid is set
 * properly. Proper error checking is up to you.
 */
$hText = imap_fetchbody($mbox, $uid, '0', FT_UID);
$headers = imap_rfc822_parse_headers($hText);
?>

The result is the same as the output of imap_headerinfo(), but you get to use the UID.
Jille at nomorecrap dot quis dot cx 06-Apr-2008 03:15
<?PHP
$headers=imap_fetchheader($imap, $msgid);
preg_match_all('/([^: ]+): (.+?(?:\r\n\s(?:.+?))*)\r\n/m', $headers, $matches);
?>

Works quite well for splitting headers,
$matches will contain 3 arrays:
$matches[0] are the full-lines (To: Jille@devnull.quis.cx\r\n)
$matches[1] will be the header (To)
$matches[2] will be the value (Jille@devnull.quis.cx)

In multi-line values the 'multilining is not stripped!'
this could be achieved with something like:
<?PHP
preg_replace('/\r\n\s+/m', '', $matches[2]);
?>
onofabio at gmail dot com 07-Mar-2008 03:18
This function ignore that some header value have multiple lines...

<?php
    // connecting to imap mailserver
    $connection = @imap_open("{localhost:143/imap}INBOX", "your_username", "your_password");

    // get imap_fetch header and put single lines into array
    $header = explode("\n", imap_fetchheader($connection, 1));

    // browse array for additional headers
    if (is_array($header) && count($header)) {
        $head = array();
        foreach($header as $line) {
            // is line with additional header?
            if (eregi("^X-", $line)) {
                // separate name and value
                eregi("^([^:]*): (.*)", $line, $arg);
                $head[$arg[1]] = $arg[2];
            }
        }
    }

    // now are all contained additional headers in array $head
?>

I write this simple function....

$mbox = imap_open("{localhost:143/imap}INBOX", "your_username", "your_password");
$mid=1 // Message id

// Get headers
$header = imap_fetchheader($mbox, $mid);

// Split on \n
$h_array=split("\n",$header);

foreach ( $h_array as $h ) {

    // Check if row start with a char
    if ( preg_match("/^[A-Z]/i", $h )) {

        $tmp = split(":",$h);
    $header_name = $tmp[0];
    $header_value = $tmp[1];
               
    $headers[$header_name] = $header_value;
       
    } else {
        // Append row to previous field
    $headers[$header_name] = $header_value . $h;
    }

}
Max Geiger 08-Mar-2007 03:59
If you call the function with the bitmask-parameter FT_PREFETCHTEXT the /Seen flag of the message will be set.
dj_doktor at upskirt dot cz 03-Apr-2005 07:17
I spend lot of time find out how I can detect messages with
different priorities. When I read users notes I remember
function imap_fetchheader which show header of message
and additional headers too. Because I'm so lazy to work with
regular expressions I required my frend for writing code
- thanx Znouza.
And there is... :)

<?php
    // connecting to imap mailserver
    $connection = @imap_open("{localhost:143/imap}INBOX", "your_username", "your_password");

    // get imap_fetch header and put single lines into array
    $header = explode("\n", imap_fetchheader($connection, 1));

    // browse array for additional headers
    if (is_array($header) && count($header)) {
        $head = array();
        foreach($header as $line) {
            // is line with additional header?
            if (eregi("^X-", $line)) {
                // separate name and value
                eregi("^([^:]*): (.*)", $line, $arg);
                $head[$arg[1]] = $arg[2];
            }
        }
    }

    // now are all contained additional headers in array $head
?>

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