使用php的编码功能-mime.inc2_PHP教程

php // $Horde: horde/lib/MIME.php,v 1.63 2001/08/08 21:00:27 chuck Exp $ $mime_types = array( TYPETEXT => text, text => TYPETEXT, TYPEMULTIPART => multipart, multipart => TYPEMULTIPART, TYPEMESSAGE => message, message => TYPEMESSAGE, TYPEAPPLICATION => application, application => TYPEAPPLICATION, TYPEAUDIO => audio, audio => TYPEAUDIO, TYPEIMAGE => image, image => TYPEIMAGE, TYPEVIDEO => video, video => TYPEVIDEO, TYPEOTHER => unknown, unknown => TYPEOTHER ); $mime_encodings = array( ENC7BIT => 7bit, 7bit => ENC7BIT, ENC8BIT => 8bit, 8bit => ENC8BIT, ENCBINARY => binary, binary => ENCBINARY, ENCBASE64 => base64, base64 => ENCBASE64, ENCQUOTEDPRINTABLE => quoted-printable, quoted-printable => ENCQUOTEDPRINTABLE, ENCOTHER => unknown, unknown => ENCOTHER ); /** * The MIME:: class provides methods for dealing with MIME standards. * * @author Chuck Hagenbuch * @version $Revision: 1.64 $ * @since Horde 1.3 * @package horde.mime */ class MIME { /** * Determine if a string contains 8-bit characters. * @access private * * @param string $string The string to check. * @return boolean true if it does, false if it doesnt. */ function is8bit($string) { if (is_string($string)) { for ($i = 0; $i > 7) return true; } return false; } return false; } /** * Encode a string containing non-ascii characters according to RFC 2047. * * @param string $text The text to encode. * @param string $charset (optional) The character set of the text. * @param boolean $outer Is this the final iteration? * * @return string The text, encoded only if it contains non-ascii characters. */ function encode($text, $charset = null, $outer = true) { if (MIME::is8bit($text)) { if (((strlen($text) * 3) + strlen($charset) + 7) > 76) { $text = MIME::encode(substr($text, 0, (23 - strlen($charset))), $charset) . MIME::encode(substr($text, (23 - strlen($charset))), $charset, false); } else { $text = "=?$charset?B?" . strtr(trim(base64_encode($text)), , _) . "?= "; } } // if this is the final iteration, take off any trailing // newline/tab chars. if ($outer && (substr($text, -2) == " ")) $text = substr($text, 0, -2); return $text; } /** * Encode a string containing email addresses according to RFC 2047. * * This differs from MIME::encode() because it keeps email * addresses legal, only encoding the personal information. * * @param string $text The email addresses to encode. * @param string $charset (optional) The character set of the text. * @param string $defserver (optional) The default domain to append to mailboxes. * * @return string The text, encoded only if it contains non-ascii characters. */ function encodeAddress($text, $charset = null, $defserver = null) { include_once Mail/RFC822.php; $addr_arr = Mail_RFC822::parseAddressList($text, $defserver, false, false); $text = ; if (is_array($addr_arr)) { foreach ($addr_arr as $addr) { if (empty($addr->personal)) { $personal = ; } else { if ((substr($addr->personal, 0, 1) == ") && (substr($addr->personal, -1) == ")) { $addr->personal = substr($addr->personal, 1, -1); } $personal = MIME::encode($addr->personal, $charset); } if (strlen($text) != 0) $text .= , ; // FIXME: dependency on imap module $text .= MIME::trimEmailAddress(imap_rfc822_write_address($addr->mailbox, $addr->host, $personal)); } } return $text; } /** * Decode an RFC 2047-encoded string. * * @param string $string The text to decode. * @return string The decoded text, or the original string if it was not encoded. */ function decode($string) { $pos = strpos($string, =?); if ($pos === false) { return $string; } // take out any spaces between multiple encoded words $string = preg_replace(|?=s=?|, ?==?, $string); $preceding = substr($string, 0, $pos); // save any preceding text $search = substr($string, $pos + 2, 75); // the mime header spec says this is the longest a single encoded word can be $d1 = strpos($search, ?); if (!is_int($d1)) { return $string; } $charset = substr($string, $pos + 2, $d1); $search = substr($search, $d1 + 1); $d2 = strpos($search, ?); if (!is_int($d2)) { return $string; } $encoding = substr($search, 0, $d2); $search = substr($search, $d2+1); $end = strpos($search, ?=); if (!is_int($end)) { return $string; } $encoded_text = substr($search, 0, $end); $rest = substr($string, (strlen($preceding . $charset . $encoding . $encoded_text) + 6)); switch ($encoding) { case Q: case q: $encoded_text = str_replace(_, %20, $encoded_text); $encoded_text = str_replace(=, %, $encoded_text); $decoded = urldecode($encoded_text); /* Convert Cyrillic character sets. */ if (stristr($GLOBALS[registry]->getCharset(), windows-1251)) { if (stristr($charset, koi8-r)) { $decoded = convert_cyr_string($decoded, k, w); } } if (stristr($GLOBALS[registry]->getCharset(), koi8-r)) { if (stristr($charset, windows-1251)) { $decoded = convert_cyr_string($decoded, w, k); } } break; case B: case b: $decoded = urldecode(base64_decode($encoded_text)); if (stristr($GLOBALS[registry]->getCharset(), windows-1251)) { if (stristr($charset, koi8-r)) { $decoded = convert_cyr_string($decoded, k, w); } } if (stristr($GLOBALS[registry]->getCharset(), koi8-r)) { if (stristr($charset, windows-1251)) { $decoded = convert_cyr_string($decoded, w, k); } } break; default: $decoded = =? . $charset . ? . $encoding . ? . $encoded_text . ?=; break; } return $preceding . $decoded . MIME::decode($rest); } /** * If an email address has no personal information, get rid of any * angle brackets () around it. * * @param string $address The address to trim. * @return string The trimmed address. */ function trimEmailAddress($address) { $address = trim($address); if ((substr($address, 0, 1) == )) { $address = substr($address, 1, -1); } return $address; } } ?>