从字符串中删除变音符号

Wordpress使用了一个功能，效果很好。这是带有输出的工作代码。

<?phpfunction seems_utf8($str){    $length = strlen($str);    for ($i=0; $i < $length; $i++) {        $c = ord($str[$i]);        if ($c < 0x80) $n = 0; # 0bbbbbbb        elseif (($c & 0xE0) == 0xC0) $n=1; # 110bbbbb        elseif (($c & 0xF0) == 0xE0) $n=2; # 1110bbbb        elseif (($c & 0xF8) == 0xF0) $n=3; # 11110bbb        elseif (($c & 0xFC) == 0xF8) $n=4; # 111110bb        elseif (($c & 0xFE) == 0xFC) $n=5; # 1111110b        else return false; # Does not match any model        for ($j=0; $j<$n; $j++) { # n bytes matching 10bbbbbb follow ? if ((++$i == $length) || ((ord($str[$i]) & 0xC0) != 0x80))     return false;        }    }    return true;}function remove_accents($string) {    if ( !preg_match('/[x80-xff]/', $string) )        return $string;    if (seems_utf8($string)) {        $chars = array(        // Decompositions for Latin-1 Supplement        chr(195).chr(128) => 'A', chr(195).chr(129) => 'A',        chr(195).chr(130) => 'A', chr(195).chr(131) => 'A',        chr(195).chr(132) => 'A', chr(195).chr(133) => 'A',        chr(195).chr(135) => 'C', chr(195).chr(136) => 'E',        chr(195).chr(137) => 'E', chr(195).chr(138) => 'E',        chr(195).chr(139) => 'E', chr(195).chr(140) => 'I',        chr(195).chr(141) => 'I', chr(195).chr(142) => 'I',        chr(195).chr(143) => 'I', chr(195).chr(145) => 'N',        chr(195).chr(146) => 'O', chr(195).chr(147) => 'O',        chr(195).chr(148) => 'O', chr(195).chr(149) => 'O',        chr(195).chr(150) => 'O', chr(195).chr(153) => 'U',        chr(195).chr(154) => 'U', chr(195).chr(155) => 'U',        chr(195).chr(156) => 'U', chr(195).chr(157) => 'Y',        chr(195).chr(159) => 's', chr(195).chr(160) => 'a',        chr(195).chr(161) => 'a', chr(195).chr(162) => 'a',        chr(195).chr(163) => 'a', chr(195).chr(164) => 'a',        chr(195).chr(165) => 'a', chr(195).chr(167) => 'c',        chr(195).chr(168) => 'e', chr(195).chr(169) => 'e',        chr(195).chr(170) => 'e', chr(195).chr(171) => 'e',        chr(195).chr(172) => 'i', chr(195).chr(173) => 'i',        chr(195).chr(174) => 'i', chr(195).chr(175) => 'i',        chr(195).chr(177) => 'n', chr(195).chr(178) => 'o',        chr(195).chr(179) => 'o', chr(195).chr(180) => 'o',        chr(195).chr(181) => 'o', chr(195).chr(182) => 'o',        chr(195).chr(182) => 'o', chr(195).chr(185) => 'u',        chr(195).chr(186) => 'u', chr(195).chr(187) => 'u',        chr(195).chr(188) => 'u', chr(195).chr(189) => 'y',        chr(195).chr(191) => 'y',        // Decompositions for Latin Extended-A        chr(196).chr(128) => 'A', chr(196).chr(129) => 'a',        chr(196).chr(130) => 'A', chr(196).chr(131) => 'a',        chr(196).chr(132) => 'A', chr(196).chr(133) => 'a',        chr(196).chr(134) => 'C', chr(196).chr(135) => 'c',        chr(196).chr(136) => 'C', chr(196).chr(137) => 'c',        chr(196).chr(138) => 'C', chr(196).chr(139) => 'c',        chr(196).chr(140) => 'C', chr(196).chr(141) => 'c',        chr(196).chr(142) => 'D', chr(196).chr(143) => 'd',        chr(196).chr(144) => 'D', chr(196).chr(145) => 'd',        chr(196).chr(146) => 'E', chr(196).chr(147) => 'e',        chr(196).chr(148) => 'E', chr(196).chr(149) => 'e',        chr(196).chr(150) => 'E', chr(196).chr(151) => 'e',        chr(196).chr(152) => 'E', chr(196).chr(153) => 'e',        chr(196).chr(154) => 'E', chr(196).chr(155) => 'e',        chr(196).chr(156) => 'G', chr(196).chr(157) => 'g',        chr(196).chr(158) => 'G', chr(196).chr(159) => 'g',        chr(196).chr(160) => 'G', chr(196).chr(161) => 'g',        chr(196).chr(162) => 'G', chr(196).chr(163) => 'g',        chr(196).chr(164) => 'H', chr(196).chr(165) => 'h',        chr(196).chr(166) => 'H', chr(196).chr(167) => 'h',        chr(196).chr(168) => 'I', chr(196).chr(169) => 'i',        chr(196).chr(170) => 'I', chr(196).chr(171) => 'i',        chr(196).chr(172) => 'I', chr(196).chr(173) => 'i',        chr(196).chr(174) => 'I', chr(196).chr(175) => 'i',        chr(196).chr(176) => 'I', chr(196).chr(177) => 'i',        chr(196).chr(178) => 'IJ',chr(196).chr(179) => 'ij',        chr(196).chr(180) => 'J', chr(196).chr(181) => 'j',        chr(196).chr(182) => 'K', chr(196).chr(183) => 'k',        chr(196).chr(184) => 'k', chr(196).chr(185) => 'L',        chr(196).chr(186) => 'l', chr(196).chr(187) => 'L',        chr(196).chr(188) => 'l', chr(196).chr(189) => 'L',        chr(196).chr(190) => 'l', chr(196).chr(191) => 'L',        chr(197).chr(128) => 'l', chr(197).chr(129) => 'L',        chr(197).chr(130) => 'l', chr(197).chr(131) => 'N',        chr(197).chr(132) => 'n', chr(197).chr(133) => 'N',        chr(197).chr(134) => 'n', chr(197).chr(135) => 'N',        chr(197).chr(136) => 'n', chr(197).chr(137) => 'N',        chr(197).chr(138) => 'n', chr(197).chr(139) => 'N',        chr(197).chr(140) => 'O', chr(197).chr(141) => 'o',        chr(197).chr(142) => 'O', chr(197).chr(143) => 'o',        chr(197).chr(144) => 'O', chr(197).chr(145) => 'o',        chr(197).chr(146) => 'OE',chr(197).chr(147) => 'oe',        chr(197).chr(148) => 'R',chr(197).chr(149) => 'r',        chr(197).chr(150) => 'R',chr(197).chr(151) => 'r',        chr(197).chr(152) => 'R',chr(197).chr(153) => 'r',        chr(197).chr(154) => 'S',chr(197).chr(155) => 's',        chr(197).chr(156) => 'S',chr(197).chr(157) => 's',        chr(197).chr(158) => 'S',chr(197).chr(159) => 's',        chr(197).chr(160) => 'S', chr(197).chr(161) => 's',        chr(197).chr(162) => 'T', chr(197).chr(163) => 't',        chr(197).chr(164) => 'T', chr(197).chr(165) => 't',        chr(197).chr(166) => 'T', chr(197).chr(167) => 't',        chr(197).chr(168) => 'U', chr(197).chr(169) => 'u',        chr(197).chr(170) => 'U', chr(197).chr(171) => 'u',        chr(197).chr(172) => 'U', chr(197).chr(173) => 'u',        chr(197).chr(174) => 'U', chr(197).chr(175) => 'u',        chr(197).chr(176) => 'U', chr(197).chr(177) => 'u',        chr(197).chr(178) => 'U', chr(197).chr(179) => 'u',        chr(197).chr(180) => 'W', chr(197).chr(181) => 'w',        chr(197).chr(182) => 'Y', chr(197).chr(183) => 'y',        chr(197).chr(184) => 'Y', chr(197).chr(185) => 'Z',        chr(197).chr(186) => 'z', chr(197).chr(187) => 'Z',        chr(197).chr(188) => 'z', chr(197).chr(189) => 'Z',        chr(197).chr(190) => 'z', chr(197).chr(191) => 's',        // Euro Sign        chr(226).chr(130).chr(172) => 'E',        // GBP (Pound) Sign        chr(194).chr(163) => '');        $string = strtr($string, $chars);    } else {        // Assume ISO-8859-1 if not UTF-8        $chars['in'] = chr(128).chr(131).chr(138).chr(142).chr(154).chr(158) .chr(159).chr(162).chr(165).chr(181).chr(192).chr(193).chr(194) .chr(195).chr(196).chr(197).chr(199).chr(200).chr(201).chr(202) .chr(203).chr(204).chr(205).chr(206).chr(207).chr(209).chr(210) .chr(211).chr(212).chr(213).chr(214).chr(216).chr(217).chr(218) .chr(219).chr(220).chr(221).chr(224).chr(225).chr(226).chr(227) .chr(228).chr(229).chr(231).chr(232).chr(233).chr(234).chr(235) .chr(236).chr(237).chr(238).chr(239).chr(241).chr(242).chr(243) .chr(244).chr(245).chr(246).chr(248).chr(249).chr(250).chr(251) .chr(252).chr(253).chr(255);        $chars['out'] = "EfSZszYcYuAAAAAACEEEEIIIINOOOOOOUUUUYaaaaaaceeeeiiiinoooooouuuuyy";        $string = strtr($string, $chars['in'], $chars['out']);        $double_chars['in'] = array(chr(140), chr(156), chr(198), chr(208), chr(222), chr(223), chr(230), chr(240), chr(254));        $double_chars['out'] = array('OE', 'oe', 'AE', 'DH', 'TH', 'ss', 'ae', 'dh', 'th');        $string = str_replace($double_chars['in'], $double_chars['out'], $string);    }    return $string;}$str = "ľ š č ť ž ý á í é Č Á Ž Ý";echo remove_accents($str); // Output: l s c t z y a i e C A Z Y?>