/** * Encodes a header value as per RFC2047 * * @param string $value The header data to encode * @param string $charset Character set name * @param string $encoding Encoding name (base64 or quoted-printable) * @param int $prefix_len Prefix length. Default: 0 * @param string $eol End-of-line sequence. Default: "\r\n" * * @return string Encoded header data * @access public * @since 1.6.1 */ public static function encodeHeaderValue($value, $charset, $encoding, $prefix_len = 0, $eol = "\r\n") { // #17311: Use multibyte aware method (requires mbstring extension) if ($result = Mail_MimePart2::encodeMB($value, $charset, $encoding, $prefix_len, $eol)) { return $result; } // Generate the header using the specified params and dynamicly // determine the maximum length of such strings. // 75 is the value specified in the RFC. $encoding = $encoding == 'base64' ? 'B' : 'Q'; $prefix = '=?' . $charset . '?' . $encoding . '?'; $suffix = '?='; $maxLength = 75 - strlen($prefix . $suffix); $maxLength1stLine = $maxLength - $prefix_len; if ($encoding == 'B') { // Base64 encode the entire string $value = base64_encode($value); // We can cut base64 every 4 characters, so the real max // we can get must be rounded down. $maxLength = $maxLength - $maxLength % 4; $maxLength1stLine = $maxLength1stLine - $maxLength1stLine % 4; $cutpoint = $maxLength1stLine; $output = ''; while ($value) { // Split translated string at every $maxLength $part = substr($value, 0, $cutpoint); $value = substr($value, $cutpoint); $cutpoint = $maxLength; // RFC 2047 specifies that any split header should // be seperated by a CRLF SPACE. if ($output) { $output .= $eol . ' '; } $output .= $prefix . $part . $suffix; } $value = $output; } else { // quoted-printable encoding has been selected $value = Mail_MimePart2::encodeQP($value); // This regexp will break QP-encoded text at every $maxLength // but will not break any encoded letters. $reg1st = "|(.{0,{$maxLength1stLine}}[^\\=][^\\=])|"; $reg2nd = "|(.{0,{$maxLength}}[^\\=][^\\=])|"; if (strlen($value) > $maxLength1stLine) { // Begin with the regexp for the first line. $reg = $reg1st; $output = ''; while ($value) { // Split translated string at every $maxLength // But make sure not to break any translated chars. $found = preg_match($reg, $value, $matches); // After this first line, we need to use a different // regexp for the first line. $reg = $reg2nd; // Save the found part and encapsulate it in the // prefix & suffix. Then remove the part from the // $value_out variable. if ($found) { $part = $matches[0]; $len = strlen($matches[0]); $value = substr($value, $len); } else { $part = $value; $value = ''; } // RFC 2047 specifies that any split header should // be seperated by a CRLF SPACE if ($output) { $output .= $eol . ' '; } $output .= $prefix . $part . $suffix; } $value = $output; } else { $value = $prefix . $value . $suffix; } } return $value; }
/** * Encodes a header as per RFC2047 * * @param string $name The header name * @param string $value The header data to encode * @param string $charset Character set name * @param string $encoding Encoding name (base64 or quoted-printable) * * @return string Encoded header data (without a name) * @access public * @since 1.5.3 * @deprecated Just use Mail_MimePart2::encodeHeader() directly with the right EOL param. */ public function encodeHeader($name, $value, $charset, $encoding) { return Mail_MimePart2::encodeHeader($name, $value, $charset, $encoding, $this->_build_params['eol']); }