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PHP : Function Reference : Multibyte String Functions : mb_encode_mimeheader

mb_encode_mimeheader

Encode string for MIME header (PHP 4 >= 4.0.6, PHP 5)
string mb_encode_mimeheader ( string str [, string charset [, string transfer_encoding [, string linefeed [, int indent]]]] )

Example 1399. mb_encode_mimeheader() example

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

Code Examples / Notes » mb_encode_mimeheader

nigrez

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;
}
?>


stormflycut

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').

masataka

second parameter 'charset' is character encoding name, but default must be UTF-8 on PHP4.3.1.

gullevek

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


chappy

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;, á','iso-8859-2');
It creates a 7bit string


paravoid

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;
}


iwakura

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


chappy

I found a bad function.
<?php
function encodeHeader($input, $charset = 'ISO-8859-2')
{
preg_match_all('/(\\w*[\\x80-\\xFF]+\\w*)/', $input, $matches);
foreach ($matches[1] as $value) {
$replacement = preg_replace('/([\\x80-\\xFF])/e', '"=" . strtoupper(dechex(ord("\\1")))', $value);
$input = str_replace($value, '=?' . $charset . '?Q?' . $replacement . '?=', $input);
}
return $input;
}
?>
This function should be used:
<?php
function encodeHeader($input, $charset = 'ISO-8859-2')
{
$m=preg_match_all('/(\w*[\x80-\xFF]+\w*)/', $input, $matches);
if($m)$input=mb_encode_mimeheader($input,$charset, 'Q');
return $input;
}
?>


mortoray

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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mb_check_encoding
mb_convert_case
mb_convert_encoding
mb_convert_kana
mb_convert_variables
mb_decode_mimeheader
mb_decode_numericentity
mb_detect_encoding
mb_detect_order
mb_encode_mimeheader
mb_encode_numericentity
mb_ereg_match
mb_ereg_replace
mb_ereg_search_getpos
mb_ereg_search_getregs
mb_ereg_search_init
mb_ereg_search_pos
mb_ereg_search_regs
mb_ereg_search_setpos
mb_ereg_search
mb_ereg
mb_eregi_replace
mb_eregi
mb_get_info
mb_http_input
mb_http_output
mb_internal_encoding
mb_language
mb_output_handler
mb_parse_str
mb_preferred_mime_name
mb_regex_encoding
mb_regex_set_options
mb_send_mail
mb_split
mb_strcut
mb_strimwidth
mb_stripos
mb_stristr
mb_strlen
mb_strpos
mb_strrchr
mb_strrichr
mb_strripos
mb_strrpos
mb_strstr
mb_strtolower
mb_strtoupper
mb_strwidth
mb_substitute_character
mb_substr_count
mb_substr
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