mb_encode_mimeheader()

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

为 MIME 头编码字符串

说明

mb_encode_mimeheader (string $str[,string $charset= determined by mb_language() [,string $transfer_encoding= "B" [,string $linefeed= "\r\n" [,int $indent= 0 ]]]] ) : string

按 MIME 头编码方案将指定的字符串$str进行编码。

参数

$str

要编码的 string。 它的编码应该和 mb_internal_encoding() 一样。

$charset

$charset指定了$str的字符集名。 其默认值由当前的 NLS 设置（mbstring.language）来确定。

$transfer_encoding

$transfer_encoding指定了 MIME 的编码方案。 它可以是"B"（Base64）也可以是"Q"（Quoted-Printable）。 如果未设置，将回退为"B"。

$linefeed

$linefeed指定了 EOL（行尾）标记，使 mb_encode_mimeheader() 执行了一个换行（» RFC 文档中规定，超过长度的一行将换成多行，当前该长度硬式编码为 74 个字符）。 如果没有设定，则回退为"\r\n"(CRLF)。

$indent

首行缩进（header 里$str前的字符数目）。

返回值

转换后的字符串版本以 ASCII 形式表达。

范例

mb_encode_mimeheader() 例子

注释

Note:

这个函数没有设计成据更高级上下文的中断点来换行（单词边界等）。 这个特性将导致意外的空格可能会让原始字符串看上去很乱。

参见

• mb_decode_mimeheader()解码 MIME 头字段中的字符串

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').

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

I could not find a PHP function to MIME encode the name for a n email address.
Input  = "Karl Müller"
Output = "Karl%20M%FCller"
I wrote it on my own: 

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. 

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  $value) {
    $value = mb_convert_encoding($value, $encoding);
    $string_array[$key] = mb_encode_mimeheader($value, $encoding);
  }
  
  //echo "
";
  //print_r($string_array);
  //echo "
";
  
  return implode("", $string_array);
}
is not the best, but it works

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

I found a bad function. 

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