Description
string 
mb_encode_mimeheader ( string str [, string charset [, string transfer_encoding [, string linefeed]]] )
     mb_encode_mimeheader() encodes a given string
     str by the MIME header encoding scheme.
     Returns a converted version of the string represented in ASCII.
    
     charset specifies the name of the character set
     in which str is represented in. The default value
     is determined by the current NLS setting (mbstring.language).
    
     transfer_encoding specifies the scheme of MIME
     encoding. It should be either "B" (Base64) or
     "Q" (Quoted-Printable). Falls back to
     "B" if not given.
    
     linefeed specifies the EOL (end-of-line) marker
     with which mb_encode_mime_header() performs
     line-folding (a RFC term,
     the act of breaking a line longer than a certain length into multiple
     lines. The length is currently hard-coded to 74 characters).
     Falls back to "\r\n" (CRLF) if not given.
    
     
| Example 1. mb_encode_mimeheader() example | 
<?php$name = ""; // kanji
 $mbox = "kru";
 $doma = "gtinn.mon";
 $addr = mb_encode_mimeheader($name, "UTF-7", "Q") . " <" . $mbox . "@" . $doma . ">";
 echo $addr;
 ?>
 | 
 | 
    Note: 
      This function isn't designed to break lines at higher-level
      contextual break points (word boundaries, etc.).
      This behaviour may clutter up the original string with unexpected spaces.
     
     See also mb_decode_mimeheader().