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821 lines
27 KiB
PHP
821 lines
27 KiB
PHP
<?php
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/**
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+-----------------------------------------------------------------------+
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| This file is part of the Roundcube Webmail client |
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| Copyright (C) 2005-2012, The Roundcube Dev Team |
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| Copyright (C) 2011-2012, Kolab Systems AG |
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| Copyright (C) 2000 Edmund Grimley Evans <edmundo@rano.org> |
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| |
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| Licensed under the GNU General Public License version 3 or |
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| any later version with exceptions for skins & plugins. |
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| See the README file for a full license statement. |
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| |
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| PURPOSE: |
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| Provide charset conversion functionality |
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+-----------------------------------------------------------------------+
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| Author: Thomas Bruederli <roundcube@gmail.com> |
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| Author: Aleksander Machniak <alec@alec.pl> |
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+-----------------------------------------------------------------------+
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*/
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/**
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* Character sets conversion functionality
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*
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* @package Framework
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* @subpackage Core
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* @author Thomas Bruederli <roundcube@gmail.com>
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* @author Aleksander Machniak <alec@alec.pl>
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* @author Edmund Grimley Evans <edmundo@rano.org>
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*/
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class rcube_charset
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{
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// Aliases: some of them from HTML5 spec.
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static public $aliases = array(
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'USASCII' => 'WINDOWS-1252',
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'ANSIX31101983' => 'WINDOWS-1252',
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'ANSIX341968' => 'WINDOWS-1252',
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'UNKNOWN8BIT' => 'ISO-8859-15',
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'UNKNOWN' => 'ISO-8859-15',
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'USERDEFINED' => 'ISO-8859-15',
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'KSC56011987' => 'EUC-KR',
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'GB2312' => 'GBK',
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'GB231280' => 'GBK',
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'UNICODE' => 'UTF-8',
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'UTF7IMAP' => 'UTF7-IMAP',
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'TIS620' => 'WINDOWS-874',
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'ISO88599' => 'WINDOWS-1254',
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'ISO885911' => 'WINDOWS-874',
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'MACROMAN' => 'MACINTOSH',
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'77' => 'MAC',
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'128' => 'SHIFT-JIS',
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'129' => 'CP949',
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'130' => 'CP1361',
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'134' => 'GBK',
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'136' => 'BIG5',
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'161' => 'WINDOWS-1253',
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'162' => 'WINDOWS-1254',
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'163' => 'WINDOWS-1258',
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'177' => 'WINDOWS-1255',
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'178' => 'WINDOWS-1256',
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'186' => 'WINDOWS-1257',
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'204' => 'WINDOWS-1251',
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'222' => 'WINDOWS-874',
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'238' => 'WINDOWS-1250',
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'MS950' => 'CP950',
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'WINDOWS949' => 'UHC',
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);
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/**
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* Catch an error and throw an exception.
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*
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* @param int $errno Level of the error
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* @param string $errstr Error message
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*/
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public static function error_handler($errno, $errstr)
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{
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throw new ErrorException($errstr, 0, $errno);
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}
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/**
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* Parse and validate charset name string (see #1485758).
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* Sometimes charset string is malformed, there are also charset aliases
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* but we need strict names for charset conversion (specially utf8 class)
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*
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* @param string $input Input charset name
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*
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* @return string The validated charset name
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*/
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public static function parse_charset($input)
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{
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static $charsets = array();
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$charset = strtoupper($input);
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if (isset($charsets[$input])) {
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return $charsets[$input];
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}
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$charset = preg_replace(array(
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'/^[^0-9A-Z]+/', // e.g. _ISO-8859-JP$SIO
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'/\$.*$/', // e.g. _ISO-8859-JP$SIO
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'/UNICODE-1-1-*/', // RFC1641/1642
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'/^X-/', // X- prefix (e.g. X-ROMAN8 => ROMAN8)
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), '', $charset);
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if ($charset == 'BINARY') {
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return $charsets[$input] = null;
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}
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// allow A-Z and 0-9 only
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$str = preg_replace('/[^A-Z0-9]/', '', $charset);
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if (isset(self::$aliases[$str])) {
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$result = self::$aliases[$str];
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}
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// UTF
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else if (preg_match('/U[A-Z][A-Z](7|8|16|32)(BE|LE)*/', $str, $m)) {
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$result = 'UTF-' . $m[1] . $m[2];
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}
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// ISO-8859
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else if (preg_match('/ISO8859([0-9]{0,2})/', $str, $m)) {
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$iso = 'ISO-8859-' . ($m[1] ?: 1);
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// some clients sends windows-1252 text as latin1,
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// it is safe to use windows-1252 for all latin1
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$result = $iso == 'ISO-8859-1' ? 'WINDOWS-1252' : $iso;
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}
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// handle broken charset names e.g. WINDOWS-1250HTTP-EQUIVCONTENT-TYPE
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else if (preg_match('/(WIN|WINDOWS)([0-9]+)/', $str, $m)) {
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$result = 'WINDOWS-' . $m[2];
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}
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// LATIN
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else if (preg_match('/LATIN(.*)/', $str, $m)) {
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$aliases = array('2' => 2, '3' => 3, '4' => 4, '5' => 9, '6' => 10,
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'7' => 13, '8' => 14, '9' => 15, '10' => 16,
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'ARABIC' => 6, 'CYRILLIC' => 5, 'GREEK' => 7, 'GREEK1' => 7, 'HEBREW' => 8
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);
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// some clients sends windows-1252 text as latin1,
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// it is safe to use windows-1252 for all latin1
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if ($m[1] == 1) {
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$result = 'WINDOWS-1252';
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}
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// if iconv is not supported we need ISO labels, it's also safe for iconv
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else if (!empty($aliases[$m[1]])) {
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$result = 'ISO-8859-'.$aliases[$m[1]];
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}
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// iconv requires convertion of e.g. LATIN-1 to LATIN1
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else {
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$result = $str;
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}
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}
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else {
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$result = $charset;
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}
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$charsets[$input] = $result;
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return $result;
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}
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/**
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* Convert a string from one charset to another.
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* Uses mbstring and iconv functions if possible
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*
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* @param string $str Input string
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* @param string $from Suspected charset of the input string
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* @param string $to Target charset to convert to; defaults to RCUBE_CHARSET
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*
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* @return string Converted string
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*/
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public static function convert($str, $from, $to = null)
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{
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static $iconv_options = null;
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static $mbstring_list = null;
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static $mbstring_sch = null;
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$to = empty($to) ? RCUBE_CHARSET : strtoupper($to);
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$from = self::parse_charset($from);
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// It is a common case when UTF-16 charset is used with US-ASCII content (#1488654)
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// In that case we can just skip the conversion (use UTF-8)
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if ($from == 'UTF-16' && !preg_match('/[^\x00-\x7F]/', $str)) {
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$from = 'UTF-8';
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}
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if ($from == $to || empty($str) || empty($from)) {
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return $str;
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}
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if ($iconv_options === null) {
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if (function_exists('iconv')) {
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// ignore characters not available in output charset
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$iconv_options = '//IGNORE';
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if (iconv('', $iconv_options, '') === false) {
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// iconv implementation does not support options
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$iconv_options = '';
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}
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}
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else {
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$iconv_options = false;
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}
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}
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// convert charset using iconv module
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if ($iconv_options !== false && $from != 'UTF7-IMAP' && $to != 'UTF7-IMAP') {
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// throw an exception if iconv reports an illegal character in input
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// it means that input string has been truncated
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set_error_handler(array('rcube_charset', 'error_handler'), E_NOTICE);
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try {
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$out = iconv($from, $to . $iconv_options, $str);
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}
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catch (ErrorException $e) {
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$out = false;
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}
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restore_error_handler();
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if ($out !== false) {
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return $out;
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}
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}
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if ($mbstring_list === null) {
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if (extension_loaded('mbstring')) {
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$mbstring_sch = mb_substitute_character();
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$mbstring_list = mb_list_encodings();
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$mbstring_list = array_map('strtoupper', $mbstring_list);
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}
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else {
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$mbstring_list = false;
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}
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}
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// convert charset using mbstring module
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if ($mbstring_list !== false) {
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$aliases['WINDOWS-1257'] = 'ISO-8859-13';
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// it happens that mbstring supports ASCII but not US-ASCII
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if (($from == 'US-ASCII' || $to == 'US-ASCII') && !in_array('US-ASCII', $mbstring_list)) {
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$aliases['US-ASCII'] = 'ASCII';
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}
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$mb_from = $aliases[$from] ?: $from;
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$mb_to = $aliases[$to] ?: $to;
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// return if encoding found, string matches encoding and convert succeeded
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if (in_array($mb_from, $mbstring_list) && in_array($mb_to, $mbstring_list)) {
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// Do the same as //IGNORE with iconv
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mb_substitute_character('none');
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// throw an exception if mbstring reports an illegal character in input
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// using mb_check_encoding() is much slower
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set_error_handler(array('rcube_charset', 'error_handler'), E_WARNING);
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try {
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$out = mb_convert_encoding($str, $mb_to, $mb_from);
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}
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catch (ErrorException $e) {
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$out = false;
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}
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restore_error_handler();
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mb_substitute_character($mbstring_sch);
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if ($out !== false) {
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return $out;
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}
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}
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}
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// convert charset using bundled classes/functions
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if ($to == 'UTF-8') {
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if ($from == 'UTF7-IMAP') {
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if ($out = self::utf7imap_to_utf8($str)) {
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return $out;
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}
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}
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else if ($from == 'UTF-7') {
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if ($out = self::utf7_to_utf8($str)) {
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return $out;
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}
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}
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else if ($from == 'ISO-8859-1' && function_exists('utf8_encode')) {
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return utf8_encode($str);
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}
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}
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// encode string for output
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if ($from == 'UTF-8') {
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// @TODO: we need a function for UTF-7 (RFC2152) conversion
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if ($to == 'UTF7-IMAP' || $to == 'UTF-7') {
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if ($out = self::utf8_to_utf7imap($str)) {
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return $out;
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}
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}
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else if ($to == 'ISO-8859-1' && function_exists('utf8_decode')) {
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return utf8_decode($str);
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}
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}
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if (!isset($out)) {
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trigger_error("No suitable function found for '$from' to '$to' conversion");
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}
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// return original string
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return $str;
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}
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/**
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* Converts string from standard UTF-7 (RFC 2152) to UTF-8.
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*
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* @param string $str Input string (UTF-7)
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*
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* @return string Converted string (UTF-8)
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*/
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public static function utf7_to_utf8($str)
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{
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$Index_64 = array(
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0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,
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0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,
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0,0,0,0, 0,0,0,0, 0,0,0,1, 0,0,0,0,
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1,1,1,1, 1,1,1,1, 1,1,0,0, 0,0,0,0,
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0,1,1,1, 1,1,1,1, 1,1,1,1, 1,1,1,1,
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1,1,1,1, 1,1,1,1, 1,1,1,0, 0,0,0,0,
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0,1,1,1, 1,1,1,1, 1,1,1,1, 1,1,1,1,
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1,1,1,1, 1,1,1,1, 1,1,1,0, 0,0,0,0,
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);
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$u7len = strlen($str);
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$str = strval($str);
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$res = '';
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for ($i=0; $u7len > 0; $i++, $u7len--) {
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$u7 = $str[$i];
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if ($u7 == '+') {
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$i++;
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$u7len--;
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$ch = '';
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for (; $u7len > 0; $i++, $u7len--) {
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$u7 = $str[$i];
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if (!$Index_64[ord($u7)]) {
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break;
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}
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$ch .= $u7;
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}
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if ($ch == '') {
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if ($u7 == '-') {
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$res .= '+';
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}
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continue;
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}
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$res .= self::utf16_to_utf8(base64_decode($ch));
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}
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else {
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$res .= $u7;
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}
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}
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return $res;
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}
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|
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/**
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* Converts string from UTF-16 to UTF-8 (helper for utf-7 to utf-8 conversion)
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*
|
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* @param string $str Input string
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*
|
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* @return string The converted string
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*/
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public static function utf16_to_utf8($str)
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{
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$len = strlen($str);
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$dec = '';
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for ($i = 0; $i < $len; $i += 2) {
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$c = ord($str[$i]) << 8 | ord($str[$i + 1]);
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if ($c >= 0x0001 && $c <= 0x007F) {
|
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$dec .= chr($c);
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}
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else if ($c > 0x07FF) {
|
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$dec .= chr(0xE0 | (($c >> 12) & 0x0F));
|
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$dec .= chr(0x80 | (($c >> 6) & 0x3F));
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$dec .= chr(0x80 | (($c >> 0) & 0x3F));
|
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}
|
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else {
|
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$dec .= chr(0xC0 | (($c >> 6) & 0x1F));
|
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$dec .= chr(0x80 | (($c >> 0) & 0x3F));
|
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}
|
|
}
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|
|
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return $dec;
|
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}
|
|
|
|
/**
|
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* Convert the data ($str) from RFC 2060's UTF-7 to UTF-8.
|
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* If input data is invalid, return the original input string.
|
|
* RFC 2060 obviously intends the encoding to be unique (see
|
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* point 5 in section 5.1.3), so we reject any non-canonical
|
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* form, such as &ACY- (instead of &-) or &AMA-&AMA- (instead
|
|
* of &AMAAwA-).
|
|
*
|
|
* Translated from C to PHP by Thomas Bruederli <roundcube@gmail.com>
|
|
*
|
|
* @param string $str Input string (UTF7-IMAP)
|
|
*
|
|
* @return string Output string (UTF-8)
|
|
*/
|
|
public static function utf7imap_to_utf8($str)
|
|
{
|
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$Index_64 = array(
|
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-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
|
|
-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
|
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-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, 63,-1,-1,-1,
|
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52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1,-1,-1,-1,
|
|
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11,12,13,14,
|
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15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,-1,
|
|
-1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40,
|
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41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1
|
|
);
|
|
|
|
$u7len = strlen($str);
|
|
$str = strval($str);
|
|
$p = '';
|
|
$err = '';
|
|
|
|
for ($i=0; $u7len > 0; $i++, $u7len--) {
|
|
$u7 = $str[$i];
|
|
if ($u7 == '&') {
|
|
$i++;
|
|
$u7len--;
|
|
$u7 = $str[$i];
|
|
|
|
if ($u7len && $u7 == '-') {
|
|
$p .= '&';
|
|
continue;
|
|
}
|
|
|
|
$ch = 0;
|
|
$k = 10;
|
|
for (; $u7len > 0; $i++, $u7len--) {
|
|
$u7 = $str[$i];
|
|
|
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if ((ord($u7) & 0x80) || ($b = $Index_64[ord($u7)]) == -1) {
|
|
break;
|
|
}
|
|
|
|
if ($k > 0) {
|
|
$ch |= $b << $k;
|
|
$k -= 6;
|
|
}
|
|
else {
|
|
$ch |= $b >> (-$k);
|
|
if ($ch < 0x80) {
|
|
// Printable US-ASCII
|
|
if (0x20 <= $ch && $ch < 0x7f) {
|
|
return $err;
|
|
}
|
|
$p .= chr($ch);
|
|
}
|
|
else if ($ch < 0x800) {
|
|
$p .= chr(0xc0 | ($ch >> 6));
|
|
$p .= chr(0x80 | ($ch & 0x3f));
|
|
}
|
|
else {
|
|
$p .= chr(0xe0 | ($ch >> 12));
|
|
$p .= chr(0x80 | (($ch >> 6) & 0x3f));
|
|
$p .= chr(0x80 | ($ch & 0x3f));
|
|
}
|
|
|
|
$ch = ($b << (16 + $k)) & 0xffff;
|
|
$k += 10;
|
|
}
|
|
}
|
|
|
|
// Non-zero or too many extra bits
|
|
if ($ch || $k < 6) {
|
|
return $err;
|
|
}
|
|
|
|
// BASE64 not properly terminated
|
|
if (!$u7len || $u7 != '-') {
|
|
return $err;
|
|
}
|
|
|
|
// Adjacent BASE64 sections
|
|
if ($u7len > 2 && $str[$i+1] == '&' && $str[$i+2] != '-') {
|
|
return $err;
|
|
}
|
|
}
|
|
// Not printable US-ASCII
|
|
else if (ord($u7) < 0x20 || ord($u7) >= 0x7f) {
|
|
return $err;
|
|
}
|
|
else {
|
|
$p .= $u7;
|
|
}
|
|
}
|
|
|
|
return $p;
|
|
}
|
|
|
|
/**
|
|
* Convert the data ($str) from UTF-8 to RFC 2060's UTF-7.
|
|
* Unicode characters above U+FFFF are replaced by U+FFFE.
|
|
* If input data is invalid, return an empty string.
|
|
*
|
|
* Translated from C to PHP by Thomas Bruederli <roundcube@gmail.com>
|
|
*
|
|
* @param string $str Input string (UTF-8)
|
|
*
|
|
* @return string Output string (UTF7-IMAP)
|
|
*/
|
|
public static function utf8_to_utf7imap($str)
|
|
{
|
|
$B64Chars = array(
|
|
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
|
|
'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd',
|
|
'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',
|
|
't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7',
|
|
'8', '9', '+', ','
|
|
);
|
|
|
|
$u8len = strlen($str);
|
|
$base64 = 0;
|
|
$i = 0;
|
|
$p = '';
|
|
$err = '';
|
|
|
|
while ($u8len) {
|
|
$u8 = $str[$i];
|
|
$c = ord($u8);
|
|
|
|
if ($c < 0x80) {
|
|
$ch = $c;
|
|
$n = 0;
|
|
}
|
|
else if ($c < 0xc2) {
|
|
return $err;
|
|
}
|
|
else if ($c < 0xe0) {
|
|
$ch = $c & 0x1f;
|
|
$n = 1;
|
|
}
|
|
else if ($c < 0xf0) {
|
|
$ch = $c & 0x0f;
|
|
$n = 2;
|
|
}
|
|
else if ($c < 0xf8) {
|
|
$ch = $c & 0x07;
|
|
$n = 3;
|
|
}
|
|
else if ($c < 0xfc) {
|
|
$ch = $c & 0x03;
|
|
$n = 4;
|
|
}
|
|
else if ($c < 0xfe) {
|
|
$ch = $c & 0x01;
|
|
$n = 5;
|
|
}
|
|
else {
|
|
return $err;
|
|
}
|
|
|
|
$i++;
|
|
$u8len--;
|
|
|
|
if ($n > $u8len) {
|
|
return $err;
|
|
}
|
|
|
|
for ($j=0; $j < $n; $j++) {
|
|
$o = ord($str[$i+$j]);
|
|
if (($o & 0xc0) != 0x80) {
|
|
return $err;
|
|
}
|
|
$ch = ($ch << 6) | ($o & 0x3f);
|
|
}
|
|
|
|
if ($n > 1 && !($ch >> ($n * 5 + 1))) {
|
|
return $err;
|
|
}
|
|
|
|
$i += $n;
|
|
$u8len -= $n;
|
|
|
|
if ($ch < 0x20 || $ch >= 0x7f) {
|
|
if (!$base64) {
|
|
$p .= '&';
|
|
$base64 = 1;
|
|
$b = 0;
|
|
$k = 10;
|
|
}
|
|
if ($ch & ~0xffff) {
|
|
$ch = 0xfffe;
|
|
}
|
|
|
|
$p .= $B64Chars[($b | $ch >> $k)];
|
|
$k -= 6;
|
|
for (; $k >= 0; $k -= 6) {
|
|
$p .= $B64Chars[(($ch >> $k) & 0x3f)];
|
|
}
|
|
|
|
$b = ($ch << (-$k)) & 0x3f;
|
|
$k += 16;
|
|
}
|
|
else {
|
|
if ($base64) {
|
|
if ($k > 10) {
|
|
$p .= $B64Chars[$b];
|
|
}
|
|
$p .= '-';
|
|
$base64 = 0;
|
|
}
|
|
|
|
$p .= chr($ch);
|
|
if (chr($ch) == '&') {
|
|
$p .= '-';
|
|
}
|
|
}
|
|
}
|
|
|
|
if ($base64) {
|
|
if ($k > 10) {
|
|
$p .= $B64Chars[$b];
|
|
}
|
|
$p .= '-';
|
|
}
|
|
|
|
return $p;
|
|
}
|
|
|
|
/**
|
|
* A method to guess character set of a string.
|
|
*
|
|
* @param string $string String
|
|
* @param string $failover Default result for failover
|
|
* @param string $language User language
|
|
*
|
|
* @return string Charset name
|
|
*/
|
|
public static function detect($string, $failover = null, $language = null)
|
|
{
|
|
if (substr($string, 0, 4) == "\0\0\xFE\xFF") return 'UTF-32BE'; // Big Endian
|
|
if (substr($string, 0, 4) == "\xFF\xFE\0\0") return 'UTF-32LE'; // Little Endian
|
|
if (substr($string, 0, 2) == "\xFE\xFF") return 'UTF-16BE'; // Big Endian
|
|
if (substr($string, 0, 2) == "\xFF\xFE") return 'UTF-16LE'; // Little Endian
|
|
if (substr($string, 0, 3) == "\xEF\xBB\xBF") return 'UTF-8';
|
|
|
|
// heuristics
|
|
if ($string[0] == "\0" && $string[1] == "\0" && $string[2] == "\0" && $string[3] != "\0") return 'UTF-32BE';
|
|
if ($string[0] != "\0" && $string[1] == "\0" && $string[2] == "\0" && $string[3] == "\0") return 'UTF-32LE';
|
|
if ($string[0] == "\0" && $string[1] != "\0" && $string[2] == "\0" && $string[3] != "\0") return 'UTF-16BE';
|
|
if ($string[0] != "\0" && $string[1] == "\0" && $string[2] != "\0" && $string[3] == "\0") return 'UTF-16LE';
|
|
|
|
if (empty($language)) {
|
|
$rcube = rcube::get_instance();
|
|
$language = $rcube->get_user_language();
|
|
}
|
|
|
|
// Prioritize charsets according to current language (#1485669)
|
|
switch ($language) {
|
|
case 'ja_JP':
|
|
$prio = array('ISO-2022-JP', 'JIS', 'UTF-8', 'EUC-JP', 'eucJP-win', 'SJIS', 'SJIS-win');
|
|
break;
|
|
|
|
case 'zh_CN':
|
|
case 'zh_TW':
|
|
$prio = array('UTF-8', 'BIG-5', 'GB2312', 'EUC-TW');
|
|
break;
|
|
|
|
case 'ko_KR':
|
|
$prio = array('UTF-8', 'EUC-KR', 'ISO-2022-KR');
|
|
break;
|
|
|
|
case 'ru_RU':
|
|
$prio = array('UTF-8', 'WINDOWS-1251', 'KOI8-R');
|
|
break;
|
|
|
|
case 'tr_TR':
|
|
$prio = array('UTF-8', 'ISO-8859-9', 'WINDOWS-1254');
|
|
break;
|
|
}
|
|
|
|
// mb_detect_encoding() is not reliable for some charsets (#1490135)
|
|
// use mb_check_encoding() to make charset priority lists really working
|
|
if ($prio && function_exists('mb_check_encoding')) {
|
|
foreach ($prio as $encoding) {
|
|
if (mb_check_encoding($string, $encoding)) {
|
|
return $encoding;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (function_exists('mb_detect_encoding')) {
|
|
if (!$prio) {
|
|
$prio = array('UTF-8', 'SJIS', 'GB2312',
|
|
'ISO-8859-1', 'ISO-8859-2', 'ISO-8859-3', 'ISO-8859-4',
|
|
'ISO-8859-5', 'ISO-8859-6', 'ISO-8859-7', 'ISO-8859-8', 'ISO-8859-9',
|
|
'ISO-8859-10', 'ISO-8859-13', 'ISO-8859-14', 'ISO-8859-15', 'ISO-8859-16',
|
|
'WINDOWS-1252', 'WINDOWS-1251', 'EUC-JP', 'EUC-TW', 'KOI8-R', 'BIG-5',
|
|
'ISO-2022-KR', 'ISO-2022-JP',
|
|
);
|
|
}
|
|
|
|
$encodings = array_unique(array_merge($prio, mb_list_encodings()));
|
|
|
|
if ($encoding = mb_detect_encoding($string, $encodings)) {
|
|
return $encoding;
|
|
}
|
|
}
|
|
|
|
// No match, check for UTF-8
|
|
// from http://w3.org/International/questions/qa-forms-utf-8.html
|
|
if (preg_match('/\A(
|
|
[\x09\x0A\x0D\x20-\x7E]
|
|
| [\xC2-\xDF][\x80-\xBF]
|
|
| \xE0[\xA0-\xBF][\x80-\xBF]
|
|
| [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}
|
|
| \xED[\x80-\x9F][\x80-\xBF]
|
|
| \xF0[\x90-\xBF][\x80-\xBF]{2}
|
|
| [\xF1-\xF3][\x80-\xBF]{3}
|
|
| \xF4[\x80-\x8F][\x80-\xBF]{2}
|
|
)*\z/xs', substr($string, 0, 2048))
|
|
) {
|
|
return 'UTF-8';
|
|
}
|
|
|
|
return $failover;
|
|
}
|
|
|
|
/**
|
|
* Removes non-unicode characters from input.
|
|
*
|
|
* @param mixed $input String or array.
|
|
*
|
|
* @return mixed String or array
|
|
*/
|
|
public static function clean($input)
|
|
{
|
|
// handle input of type array
|
|
if (is_array($input)) {
|
|
foreach ($input as $idx => $val) {
|
|
$input[$idx] = self::clean($val);
|
|
}
|
|
return $input;
|
|
}
|
|
|
|
if (!is_string($input) || $input == '') {
|
|
return $input;
|
|
}
|
|
|
|
// iconv/mbstring are much faster (especially with long strings)
|
|
if (function_exists('mb_convert_encoding')) {
|
|
$msch = mb_substitute_character();
|
|
mb_substitute_character('none');
|
|
$res = mb_convert_encoding($input, 'UTF-8', 'UTF-8');
|
|
mb_substitute_character($msch);
|
|
|
|
if ($res !== false) {
|
|
return $res;
|
|
}
|
|
}
|
|
|
|
if (function_exists('iconv')) {
|
|
if (($res = @iconv('UTF-8', 'UTF-8//IGNORE', $input)) !== false) {
|
|
return $res;
|
|
}
|
|
}
|
|
|
|
$seq = '';
|
|
$out = '';
|
|
$regexp = '/^('.
|
|
// '[\x00-\x7F]'. // UTF8-1
|
|
'|[\xC2-\xDF][\x80-\xBF]'. // UTF8-2
|
|
'|\xE0[\xA0-\xBF][\x80-\xBF]'. // UTF8-3
|
|
'|[\xE1-\xEC][\x80-\xBF][\x80-\xBF]'. // UTF8-3
|
|
'|\xED[\x80-\x9F][\x80-\xBF]'. // UTF8-3
|
|
'|[\xEE-\xEF][\x80-\xBF][\x80-\xBF]'. // UTF8-3
|
|
'|\xF0[\x90-\xBF][\x80-\xBF][\x80-\xBF]'. // UTF8-4
|
|
'|[\xF1-\xF3][\x80-\xBF][\x80-\xBF][\x80-\xBF]'.// UTF8-4
|
|
'|\xF4[\x80-\x8F][\x80-\xBF][\x80-\xBF]'. // UTF8-4
|
|
')$/';
|
|
|
|
for ($i = 0, $len = strlen($input); $i < $len; $i++) {
|
|
$chr = $input[$i];
|
|
$ord = ord($chr);
|
|
|
|
// 1-byte character
|
|
if ($ord <= 0x7F) {
|
|
if ($seq !== '') {
|
|
$out .= preg_match($regexp, $seq) ? $seq : '';
|
|
$seq = '';
|
|
}
|
|
|
|
$out .= $chr;
|
|
}
|
|
// first byte of multibyte sequence
|
|
else if ($ord >= 0xC0) {
|
|
if ($seq !== '') {
|
|
$out .= preg_match($regexp, $seq) ? $seq : '';
|
|
$seq = '';
|
|
}
|
|
|
|
$seq = $chr;
|
|
}
|
|
// next byte of multibyte sequence
|
|
else if ($seq !== '') {
|
|
$seq .= $chr;
|
|
}
|
|
}
|
|
|
|
if ($seq !== '') {
|
|
$out .= preg_match($regexp, $seq) ? $seq : '';
|
|
}
|
|
|
|
return $out;
|
|
}
|
|
}
|