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  $subject = encode($subject,'ISO-8859-1');

function encode($in_str, $charset) {

  $out_str = $in_str;

  if ($out_str && $charset) {

    // define start delimimter, end delimiter and spacer

    $end = "?=";

    $start = "=?" . $charset . "?B?";

    $spacer = $end . "\r\n " . $start;

    // determine length of encoded text within chunks

    // and ensure length is even

    $length = 75 - strlen($start) - strlen($end);

    /*

            [EDIT BY danbrown AT php DOT net: The following

            is a bugfix provided by (gardan AT gmx DOT de)

            on 31-MAR-2005 with the following note:

            "This means: $length should not be even,

            but divisible by 4. The reason is that in

            base64-encoding 3 8-bit-chars are represented

            by 4 6-bit-chars. These 4 chars must not be

            split between two encoded words, according

            to RFC-2047.

    */

    $length = $length - ($length % 4);

    // encode the string and split it into chunks

    // with spacers after each chunk

    $out_str = base64_encode($out_str);

    $out_str = chunk_split($out_str, $length, $spacer);

    // remove trailing spacer and

    // add start and end delimiters

    $spacer = preg_quote($spacer);

    $out_str = preg_replace("/" . $spacer . "$/", "", $out_str);

    $out_str = $start . $out_str . $end;

  }

  return $out_str;

}