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mb_encode_mimeheader

(PHP 4 >= 4.0.6, PHP 5, PHP 7, PHP 8)

mb_encode_mimeheaderDizgeyi MIME başlığı için kodlar

Açıklama

mb_encode_mimeheader(
    string $dizge,
    ?string $karküm = null,
    ?string $aktarım_kodlaması = null,
    string $satırsonu = "\r\n",
    int $girinti = 0
): string

Belirtilen dizge dizgesini MIME başlığı kodlama şemasına göre kodlar.

Bağımsız Değişkenler

dizge

Kodlanacak dizge. Kodlaması mb_internal_encoding() ile aynı olmalıdır.

karküm

Dizgenin kodlanacağı karakter kümesinin ismi. Öntanımlı değer geçerli yerel dil ayarından (mbstring.language) alınır.

aktarım_kodlaması

aktarım_kodlaması ile MIME kodlama şeması belirtilir. "B" (Base64) veya "Q" (Quoted-Printable) olmalıdır. Belirtilmezse son çare olarak "B" kullanılır.

satırsonu

mb_encode_mimeheader() işlevinin satırları katlayabilmesi için satır sonu imleyici belirtir. (» RFC gereği belli bir uzunluktan daha uzun satırların katlanması gerekir. Bu uzunluk şimdilik 74 bayttır.) Belirtilmediği takdirde son çare olarak "\r\n" (CRLF) kullanılır.

girinti

İlk satırın girinti miktarı (Başlıkta dizge dizgesinden önceki karakter sayısı).

Dönen Değerler

Belirtilen dizgenin ASCII'ye dönüştürülmüş gösterimi döner.

Sürüm Bilgisi

Sürüm: Açıklama
8.0.0 karküm ve aktarım_kodlaması artık null olabiliyor.

Örnekler

Örnek 1 - mb_encode_mimeheader() örneği

<?php
$name
= "太郎"; // kanji
$mbox = "kru";
$domain = "gtinn.mon";
$addr = '"' . addcslashes(mb_encode_mimeheader($name, "UTF-7", "Q"), '"') . '" <' . $mbox . "@" . $domain . ">";
echo
$addr;
?>

Yukarıdaki örneğin çıktısı:

"=?UTF-7?Q?+WSqQzg-?=" <kru@gtinn.mon>

Notlar

Bilginize:

Bu işlev daha yüksek seviyeden satır katlamaları için tasarlanmamıştır (sözcükleri bölmeden katlamak gibi). Bu davranış özgün dizgenin beklenmedik boşluklarla düzensizleşmesine sebep olabilir.

Ayrıca Bakınız

add a note

User Contributed Notes 10 notes

up
7
stormflyCUT at hyh dot pl
17 years ago
Some solution for using national chars and have problem with UTF-8 for example in mail subject. Before you use mb_encode_mimeheader with UTF-8 set mb_internal_encoding('UTF-8').
up
3
Anonymous
14 years ago
I could not find a PHP function to MIME encode the name for a n email address.

Input = "Karl Müller<kmueller@gmx.de>"
Output = "Karl%20M%FCller<kmueller@gmx.de>"

I wrote it on my own:

<?php
// required to encode names in email addresses
// replace " " with "%20"
// replace "ü" with "%FC"
// replace "%" with "%25" etc....
// Use "%" as Delimiter for MIME
// Use "=" as Delimiter for Quoted Printable
// Input string must be UTF8 encoded
public static function EncodeMime($Text, $Delimiter)
{
$Text = utf8_decode($Text);
$Len = strlen($Text);
$Out = "";
for (
$i=0; $i<$Len; $i++)
{
$Chr = substr($Text, $i, 1);
$Asc = ord($Chr);

if (
$Asc > 0x255) // Unicode not allowed
{
$Out .= "?";
}
else if (
$Chr == " " || $Chr == $Delimiter || $Asc > 127)
{
$Out .= $Delimiter . strtoupper(bin2hex($Chr));
}
else
$Out .= $Chr;
}
return
$Out;
}
?>
up
1
nigrez at nius dot waw dot pl
18 years ago
True, function is broken (PHP5.1, encoding from UTF-8 with pl_PL charset). Below is about 15% faster version of proposed _mb_mime_encode. Also it has header more like othe mb_* functions and doesn't trigger any errors/warnings/notices.

<?php

function mb_mime_header($string, $encoding=null, $linefeed="\r\n") {
if(!
$encoding) $encoding = mb_internal_encoding();
$encoded = '';

while(
$length = mb_strlen($string)) {
$encoded .= "=?$encoding?B?"
. base64_encode(mb_substr($string,0,24,$encoding))
.
"?=$linefeed";

$string = mb_substr($string,24,$length,$encoding);
}

return
$encoded;
}

?>
up
2
gullevek at gullevek dot org
20 years ago
Read this FIRST: http://bugs.php.net/bug.php?id=23192 because mb_encode_mimeheaders is BUGGY!

a work around for the multibyte broken error for too long subjects for ISO-2022-JP:

$pos=0;
$split=36; // after 36 single bytes characters, if then comes MB, it is broken
while ($pos<mb_strlen($string,$encoding))
{
$output=mb_strimwidth($string,$pos,$split,"",$encoding);
$pos+=mb_strlen($output,$encoding);
$_string.=(($_string)?' ':'').mb_encode_mimeheader($output,$encoding);
}
$string=$_string;

is not the best, but it works
up
1
tokul at users dot sourceforge dot net
15 years ago
mb_encode_mimeheader() depends on correct mbstring.internal_encoding setting. It tries to convert $str from internal encoding to $charset. If you ignore mbstring internal encoding, function might encode strings incorrectly even when $str character set matches $charset
up
1
gullevek at gullevek dot org
18 years ago
My first post was around 2003, and still the mb_mime_header is broken. It is *NOT* usable with longer subjects, and mostly unusable with anything else than japanese.

iwakura at junx dot org is also not working for me, it produces also some gargabe.

I updated my old function (the one I posted 2003) and I tested it with overlong subjects in UTF-8, ISO-2022-JP (japanese), GB2312 (simplified chinese) and EUC-KR (korean) and I got readable results in thunderbird, mail.app, outlook, etc.

<?php

function _mb_mime_encode($string, $encoding)
{
$pos = 0;
// after 36 single bytes characters if then comes MB, it is broken
// but I trimmed it down to 24, to stay 100% < 76 chars per line
$split = 24;
while (
$pos < mb_strlen($string, $encoding))
{
$output = mb_strimwidth($string, $pos, $split, "", $encoding);
$pos += mb_strlen($output, $encoding);
$_string_encoded = "=?".$encoding."?B?".base64_encode($output)."?=";
if (
$_string)
$_string .= "\r\n";
$_string .= $_string_encoded;
}
$string = $_string;
return
$string;
}

?>
up
0
paravoid
18 years ago
If mb_ version doesn't work for you in MIME-B mode:

function encode_mimeheader($string, $charset=null, $linefeed="\r\n") {
if (!$charset)
$charset = mb_internal_encoding();

$start = "=?$charset?B?";
$end = "?=";
$encoded = '';

/* Each line must have length <= 75, including $start and $end */
$length = 75 - strlen($start) - strlen($end);
/* Average multi-byte ratio */
$ratio = mb_strlen($string, $charset) / strlen($string);
/* Base64 has a 4:3 ratio */
$magic = $avglength = floor(3 * $length * $ratio / 4);

for ($i=0; $i <= mb_strlen($string, $charset); $i+=$magic) {
$magic = $avglength;
$offset = 0;
/* Recalculate magic for each line to be 100% sure */
do {
$magic -= $offset;
$chunk = mb_substr($string, $i, $magic, $charset);
$chunk = base64_encode($chunk);
$offset++;
} while (strlen($chunk) > $length);
if ($chunk)
$encoded .= ' '.$start.$chunk.$end.$linefeed;
}
/* Chomp the first space and the last linefeed */
$encoded = substr($encoded, 1, -strlen($linefeed));

return $encoded;
}
up
0
chappy at citromail dot hu
18 years ago
In countries where there's non-us ASCII, it's a very good example, for sending mail:

mb_internal_encoding('iso-8859-2');
setlocale(LC_CTYPE, 'hu_HU');

function encode($str,$charset){
$str=mb_encode_mimeheader(trim($str),$charset, 'Q', "\n\t");
return $str;
}

print encode('the text with spec. chars: &#337; &#368; &#336; &#369;, ?','iso-8859-2');

It creates a 7bit string
up
-1
iwakura at junx dot org
18 years ago
i think mb_encode_mimeheader still have bug. here is sample code:

function mb_encode_mimeheader2($string, $encoding = "ISO-2022-JP") {
$string_array = array();
$pos = 0;
$row = 0;
$mode = 0;

while ($pos < mb_strlen($string)) {
$word = mb_strimwidth($string, $pos, 1);
if (!$word) {
$word = mb_strimwidth($string, $pos, 2);
}
if (mb_ereg_match("[ -~]", $word)) { // ascii
if ($mode != 1) {
$row++;
$mode = 1;
$string_array[$row] = NULL;
}
} else { // multibyte
if ($mode != 2) {
$row++;
$mode = 2;
$string_array[$row] = NULL;
}
}
$string_array[$row] .= $word;
$pos++;
}

//echo "<pre>";
//print_r($string_array);
//echo "</pre>";

foreach ($string_array as $key => $value) {
$value = mb_convert_encoding($value, $encoding);
$string_array[$key] = mb_encode_mimeheader($value, $encoding);
}

//echo "<pre>";
//print_r($string_array);
//echo "</pre>";

return implode("", $string_array);
}

is not the best, but it works
up
-3
mortoray at ecircle-ag dot com
19 years ago
At least for Q encoding, this function is unsafe and does not encode correctly. Raw characters which appear as RFC2047 sequences are simply left as is.

Ex:

mb_encode_mimeheader( '=?iso-8859-1?q?this=20is=20some=20text?=' );

returns '=?iso-8859-1?q?this=20is=20some=20text?='

The exact same string, which is obviously not the encoding for the source string. That is, mb_encode_mimeheader does not do any type of escaping.

That is, the following condition is not always true:
mb_decode_mimeheader( mb_encode_mimeheader( $text ) ) == $text
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