[code] function encode_header ($str, $position = 'text') {
$x = 0;
switch (strtolower($position)) {
case 'phrase':
if (preg_match_all('/[\200-\377]/', $str, $matches) == 0) {
// Can't use addslashes as we don't know what value has magic_quotes_sybase.
$encoded = addcslashes($str, '\000-\037\177');
$encoded = preg_replace('/([\"])/', '\\"', $encoded);
if (($str == $encoded) && (preg_match_all('/[^A-Za-z0-9!#$%&\'*+\/=?^_`{|}~ -]/', $str, $matches) == 0))
return ($encoded);
else
return ("\"$encoded\"");
}
$x = preg_match_all('/[^\040\041\043-\133\135-\176]/', $str, $matches);
break;
case 'comment':
$x = preg_match_all('/[()"]/', $str, $matches);
// Fall-through
case 'text':
default:
$x += preg_match_all('/[\000-\010\013\014\016-\037\177-\377]/', $str, $matches);
break;
}
if ($x == 0)
return ($str);
$maxlen = 75 - 7 - strlen($this->CharSet);
// Try to select the encoding which should produce the shortest output
if (strlen($str)/3 < $x) {
$encoding = 'B';
$encoded = base64_encode($str);
$maxlen -= $maxlen % 4;
$encoded = trim(chunk_split($encoded, $maxlen, "\n"));
} else {
$encoding = 'Q';
$encoded = $this->encode_q($str, $position);
$encoded = $this->word_wrap($encoded, $maxlen, true);
$encoded = str_replace("=".$this->LE, "\n", trim($encoded));
}
$encoded = preg_replace('/^(.*)$/m', " =?".$this->CharSet."?$encoding?\\1?=", $encoded);
$encoded = trim(str_replace("\n", $this->LE, $encoded));
return($encoded);
}
[/code]
