imap_mime_header_decode

Anonymous (2013-03-04 21:42:03)

A nice way to decode strings is to use the mb_list_encodings(), but I had two problems with it: 
sometimes, the charset is uppercase in the header an lowercase in mb_list_encodings() and sometimes, the charset is not in the mb_list_encodings() list.

<?php
function upperListEncode() { //convert mb_list_encodings() to uppercase
    $encodes=mb_list_encodings();
    foreach ($encodes as $encode) $tencode[]=strtoupper($encode);
    return $tencode;
    }

function decode($string) {
    $tabChaine=imap_mime_header_decode($string);
    $texte='';
    for ($i=0; $i<count($tabChaine); $i++) {
        
        switch (strtoupper($tabChaine[$i]->charset)) { //convert charset to uppercase
            case 'UTF-8': $texte.= $tabChaine[$i]->text; //utf8 is ok
                break;
            case 'DEFAULT': $texte.= $tabChaine[$i]->text; //no convert
                break;
            default: if (in_array(strtoupper($tabChaine[$i]->charset),upperListEncode())) //found in mb_list_encodings()
                        {$texte.= mb_convert_encoding($tabChaine[$i]->text,'UTF-8',$tabChaine[$i]->charset);}
                     else { //try to convert with iconv()
                          $ret = iconv($tabChaine[$i]->charset, "UTF-8", $tabChaine[$i]->text);    
                          if (!$ret) $texte.=$tabChaine[$i]->text;  //an error occurs (unknown charset) 
                          else $texte.=$ret;
                        }                    
                break;
            }
        }
        
    return $texte;    
    }
?>

kai at froghh dot de (2008-08-04 09:25:43)

Beware of multilined subjects containing whitespaces which are not part of the subject itself, but needed as functional characters for the clients.
i.e. you can have a mail header containing content like
Subject: =?iso-8859-1?Q?WG=3A_Mobilit=E4t_verschlechtert_--=3E_174?=
=?iso-8859-1?Q?6?=
(carriage return and tabspace).
imap_mime_header_decode returns 5 parts (and not expected 2)
for this example.
- The first containing the space between "subject:" and the subject itself.
- The second is the first encoded text
- The third will be the line-break within the head lines.
The were inserted to keep rfc compliant line length and are NOT part of the original subject entered by the sender.
- The fourth will be the second part of the subject.
- The fifth is a line break - the last character will be a line break any time other head lines or mailbody will follow, so it's needed in the head - but not part of the original subject.

s dot wiese at trabia dot md (2007-12-18 13:46:16)

The example of diego is working well, he has a (very) little
mistake in his code. Here is the corrected version:

<?php
//return supported encodings in lowercase.
function mb_list_lowerencodings() { $r=mb_list_encodings();
  for ($n=sizeOf($r); $n--; ) { $r[$n]=strtolower($r[$n]); } return $r;
}

//  Receive a string with a mail header and returns it
// decoded to a specified charset.
// If the charset specified into a piece of text from header
// isn't supported by "mb", the "fallbackCharset" will be
// used to try to decode it.
function decodeMimeString($mimeStr, $inputCharset='utf-8', $targetCharset='utf-8', $fallbackCharset='iso-8859-1') {
  $encodings=mb_list_lowerencodings();
  $inputCharset=strtolower($inputCharset);
  $targetCharset=strtolower($targetCharset);
  $fallbackCharset=strtolower($fallbackCharset);

  $decodedStr='';
  $mimeStrs=imap_mime_header_decode($mimeStr);
  for ($n=sizeOf($mimeStrs), $i=0; $i<$n; $i++) {
    $mimeStr=$mimeStrs[$i];
    $mimeStr->charset=strtolower($mimeStr->charset);
    if (($mimeStr == 'default' && $inputCharset == $targetCharset)
      || $mimStr->charset == $targetCharset) {
      $decodedStr.=$mimStr->text;
    } else {
      $decodedStr.=mb_convert_encoding(
        $mimeStr->text, $targetCharset,
        (in_array($mimeStr->charset, $encodings) ?
          $mimeStr->charset : $fallbackCharset)
        )
      );
    }
  } return $decodedStr;
}
?>

diego nunes <dn at nospam dot dnunes dot com> (2006-12-14 10:12:59)

The previous comment (from hans) seems to make no sense at all, since it will not change the encoding and possibly result in a "multiencoding" string (that the browser and anything else will be unable to render, of course).

    I use a little function to decode the whole header to a specified encoding. It is as follow:

<?php
//return supported encodings in lowercase.
function mb_list_lowerencodings() { $r=mb_list_encodings();
  for ($n=sizeOf($r); $n--; ) { $r[$n]=strtolower($r[$n]); } return $r;
}

//  Receive a string with a mail header and returns it
// decoded to a specified charset.
// If the charset specified into a piece of text from header
// isn't supported by "mb", the "fallbackCharset" will be
// used to try to decode it.
function decodeMimeString($mimeStr, $inputCharset='utf-8', $targetCharset='utf-8', $fallbackCharset='iso-8859-1') {
  $encodings=mb_list_lowerencodings();
  $inputCharset=strtolower($inputCharset);
  $targetCharset=strtolower($targetCharset);
  $fallbackCharset=strtolower($fallbackCharset);

  $decodedStr='';
  $mimeStrs=imap_mime_header_decode($mimeStr);
  for ($n=sizeOf($mimeStrs), $i=0; $i<$n; $i++) {
    $mimeStr=$mimeStrs[$i];
    $mimeStr->charset=strtolower($mimeStr->charset);
    if (($mimeStr == 'default' && $inputCharset == $targetCharset)
      || $mimStr->charset == $targetCharset) {
      $decodedStr.=$mimStr->text;
    } else {
      $decodedStr.=mb_convert_encoding(
        $mimeStr->text, $targetCharset,
        (in_array($mimeStr->charset, $encodings) ?
          $mimeStr->charset : $fallbackCharset)
        )
      );
    }
  } return $decodedStr;
}
?>

    Hope it helps.

hans at lintoo dot dk (2005-12-22 06:10:51)

This is obvious, but nevertheless here is a "flat" version:
<?php    
private function flatMimeDecode($string) {
    $array = imap_mime_header_decode($string);
    $str = "";
    foreach ($array as $key => $part) {
        $str .= $part->text;
    }
    return $str;
}
?>

cracker at bigcracker dot ca (2005-02-22 04:55:52)

In response to Sven dot Dickert at planb dot de: if you encounter problems with "=?utf-8?Q?" appearing in your headers, I found that simply using "imap_utf8($string)" decoded the "$string" properly and solved my problem perfectly.

Pawel Tomicki <pafka at klub dot chip dot pl> (2004-04-22 11:04:10)

<?php

function decode_iso88591($string){
  if (strpos(strtolower($string), '=?iso-8859-1') === false) {
    return $string;
  }
  $string = explode('?', $string);
  return strtolower($string[2]) == 'q' ? quoted_printable_decode($string[3]) : base64_decode($string[3]);
}

?>

mattias at forss dot se (2003-11-26 19:45:12)

This function does not code a-z 0-9 like the function posted by bandpay at hotmail dot com
function encode_iso88591($string) {
if( ereg("[^A-Za-z0-9\ ]", $string) ) {
$text = "=?iso-8859-1?q?";
for( $i = 0 ; $i < strlen($string) ; $i++ ) {
if( ereg("[^A-Za-z0-9]", $string[$i]) ) {
$text .= "=".dechex(ord($string[$i]));
} else {
$text .= $string[$i];
}
}
return $text."?=";
} else return $string;
}

hdlim at kis21 dot com (2003-01-01 10:35:27)

imap_mime_header_decode, utf-7 and utf-8 problem, i solved the problem using below function. note that iconv function for code converting.
you must replace "EUC-KR" as iconv parameter with charset you want such as "iso-8859-1".
function mime_decode($s) {
$elements = imap_mime_header_decode($s);
for($i = 0;$i < count($elements);$i++) {
$charset = $elements[$i]->charset;
$text =$elements[$i]->text;
if(!strcasecmp($charset, "utf-8") ||
!strcasecmp($charset, "utf-7"))
{
$text = iconv($charset, "EUC-KR", $text);
}
$decoded = $decoded . $text;
}
return $decoded;
}

Sven dot Dickert at planb dot de (2002-05-16 06:31:35)

charsyam at liso dot cs dot pusan dot ac dot kr (2001-08-13 08:34:48)

I wrote a simple ks_c_5601-1987(2byte)
encode
function encode_ksc5601( $string )
{
$encode = base64_encode( $string );
$text = "=?ks_c_5601-1987?B?";
$text = $text.$encode."?=";
return $text;
}