remove_accents

函数



      remove_accents ( $string, $locale = '' )

参数

(string)
$string
Text that might have accent characters.
Required: 是
(string)
$locale
Optional. The locale to use for accent removal. Some character replacements depend on the locale being used (e.g. ‘de_DE’). Defaults to the current locale.
Required: 否

Default: (empty)

返回值

(string) Filtered string with replaced “nice” characters.

定义位置

wp-includes/formatting.php
, line 1595

引入: 1.2.1

弃用: –

Converts all accent characters to ASCII characters.

If there are no accent characters, then the string given is just returned.

**Accent characters converted:**

Currency signs:

| Code | Glyph | Replacement | Description |
| ——– | —– | ———– | ——————- |
| U+00A3 | £ | (empty) | British Pound sign |
| U+20AC | € | E | Euro sign |

Decompositions for Latin-1 Supplement:

| Code | Glyph | Replacement | Description |
| ——- | —– | ———– | ————————————– |
| U+00AA | ª | a | Feminine ordinal indicator |
| U+00BA | º | o | Masculine ordinal indicator |
| U+00C0 | À | A | Latin capital letter A with grave |
| U+00C1 | Á | A | Latin capital letter A with acute |
| U+00C2 | Â | A | Latin capital letter A with circumflex |
| U+00C3 | Ã | A | Latin capital letter A with tilde |
| U+00C4 | Ä | A | Latin capital letter A with diaeresis |
| U+00C5 | Å | A | Latin capital letter A with ring above |
| U+00C6 | Æ | AE | Latin capital letter AE |
| U+00C7 | Ç | C | Latin capital letter C with cedilla |
| U+00C8 | È | E | Latin capital letter E with grave |
| U+00C9 | É | E | Latin capital letter E with acute |
| U+00CA | Ê | E | Latin capital letter E with circumflex |
| U+00CB | Ë | E | Latin capital letter E with diaeresis |
| U+00CC | Ì | I | Latin capital letter I with grave |
| U+00CD | Í | I | Latin capital letter I with acute |
| U+00CE | Î | I | Latin capital letter I with circumflex |
| U+00CF | Ï | I | Latin capital letter I with diaeresis |
| U+00D0 | Ð | D | Latin capital letter Eth |
| U+00D1 | Ñ | N | Latin capital letter N with tilde |
| U+00D2 | Ò | O | Latin capital letter O with grave |
| U+00D3 | Ó | O | Latin capital letter O with acute |
| U+00D4 | Ô | O | Latin capital letter O with circumflex |
| U+00D5 | Õ | O | Latin capital letter O with tilde |
| U+00D6 | Ö | O | Latin capital letter O with diaeresis |
| U+00D8 | Ø | O | Latin capital letter O with stroke |
| U+00D9 | Ù | U | Latin capital letter U with grave |
| U+00DA | Ú | U | Latin capital letter U with acute |
| U+00DB | Û | U | Latin capital letter U with circumflex |
| U+00DC | Ü | U | Latin capital letter U with diaeresis |
| U+00DD | Ý | Y | Latin capital letter Y with acute |
| U+00DE | Þ | TH | Latin capital letter Thorn |
| U+00DF | ß | s | Latin small letter sharp s |
| U+00E0 | à | a | Latin small letter a with grave |
| U+00E1 | á | a | Latin small letter a with acute |
| U+00E2 | â | a | Latin small letter a with circumflex |
| U+00E3 | ã | a | Latin small letter a with tilde |
| U+00E4 | ä | a | Latin small letter a with diaeresis |
| U+00E5 | å | a | Latin small letter a with ring above |
| U+00E6 | æ | ae | Latin small letter ae |
| U+00E7 | ç | c | Latin small letter c with cedilla |
| U+00E8 | è | e | Latin small letter e with grave |
| U+00E9 | é | e | Latin small letter e with acute |
| U+00EA | ê | e | Latin small letter e with circumflex |
| U+00EB | ë | e | Latin small letter e with diaeresis |
| U+00EC | ì | i | Latin small letter i with grave |
| U+00ED | í | i | Latin small letter i with acute |
| U+00EE | î | i | Latin small letter i with circumflex |
| U+00EF | ï | i | Latin small letter i with diaeresis |
| U+00F0 | ð | d | Latin small letter Eth |
| U+00F1 | ñ | n | Latin small letter n with tilde |
| U+00F2 | ò | o | Latin small letter o with grave |
| U+00F3 | ó | o | Latin small letter o with acute |
| U+00F4 | ô | o | Latin small letter o with circumflex |
| U+00F5 | õ | o | Latin small letter o with tilde |
| U+00F6 | ö | o | Latin small letter o with diaeresis |
| U+00F8 | ø | o | Latin small letter o with stroke |
| U+00F9 | ù | u | Latin small letter u with grave |
| U+00FA | ú | u | Latin small letter u with acute |
| U+00FB | û | u | Latin small letter u with circumflex |
| U+00FC | ü | u | Latin small letter u with diaeresis |
| U+00FD | ý | y | Latin small letter y with acute |
| U+00FE | þ | th | Latin small letter Thorn |
| U+00FF | ÿ | y | Latin small letter y with diaeresis |

Decompositions for Latin Extended-A:

| Code | Glyph | Replacement | | ——- | —– | U+0100 | Ā | A | U+0101 | ā | a | U+0102 | Ă | A | U+0103 | ă | a | U+0104 | Ą | A | U+0105 | ą | a | U+01006 | Ć | C | U+0107 | ć | c | U+0108 | Ĉ | C | U+0109 | ĉ | c | U+010A | Ċ | C | U+010B | ċ | c | U+010C | Č | C | U+010D | č | c | U+010E | Ď | D | U+010F | ď | d | U+0110 | Đ | D | U+0111 | đ | d | U+0112 | Ē | E | U+0113 | ē | e | U+0114 | Ĕ | E | U+0115 | ĕ | e | U+0116 | Ė | E | U+0117 | ė | e | U+0118 | Ę | E | U+0119 | ę | e | U+011A | Ě | E | U+011B | ě | e | U+011C | Ĝ | G | U+011D | ĝ | g | U+011E | Ğ | G | U+011F | ğ | g | U+0120 | Ġ | G | U+0121 | ġ | g | U+0122 | Ģ | G | U+0123 | ģ | g | U+0124 | Ĥ | H | U+0125 | ĥ | h | U+0126 | Ħ | H | U+0127 | ħ | h | U+0128 | Ĩ | I | U+0129 | ĩ | i | U+012A | Ī | I | U+012B | ī | i | U+012C | Ĭ | I | U+012D | ĭ | i | U+012E | Į | I | U+012F | į | i | U+0130 | İ | I | U+0131 | ı | i | U+0132 | Ĳ | IJ | U+0133 | ĳ | ij | U+0134 | Ĵ | J | U+0135 | ĵ | j | U+0136 | Ķ | K | U+0137 | ķ | k | U+0138 | ĸ | k | U+0139 | Ĺ | L | U+013A | ĺ | l | U+013B | Ļ | L | U+013C | ļ | l | U+013D | Ľ | L | U+013E | ľ | l | U+013F | Ŀ | L | U+0140 | ŀ | l | U+0141 | Ł | L | U+0142 | ł | l | U+0143 | Ń | N | U+0144 | ń | n | U+0145 | Ņ | N | U+0146 | ņ | n | U+0147 | Ň | N | U+0148 | ň | n | U+0149 | ŉ | n | U+014A | Ŋ | N | U+014B | ŋ | n | U+014C | Ō | O | U+014D | ō | o | U+014E | Ŏ | O | U+014F | ŏ | o | U+0150 | Ő | O | U+0151 | ő | o | U+0152 | Œ | OE | U+0153 | œ | oe | U+0154 | Ŕ | R | U+0155 | ŕ | r | U+0156 | Ŗ | R | U+0157 | ŗ | r | U+0158 | Ř | R | U+0159 | ř | r | U+015A | Ś | S | U+015B | ś | s | U+015C | Ŝ | S | U+015D | ŝ | s | U+015E | Ş | S | U+015F | ş | s | U+0160 | Š | S | U+0161 | š | s | U+0162 | Ţ | T | U+0163 | ţ | t | U+0164 | Ť | T | U+0165 | ť | t | U+0166 | Ŧ | T | U+0167 | ŧ | t | U+0168 | Ũ | U | U+0169 | ũ | u | U+016A | Ū | U | U+016B | ū | u | U+016C | Ŭ | U | U+016D | ŭ | u | U+016E | Ů | U | U+016F | ů | u | U+0170 | Ű | U | U+0171 | ű | u | U+0172 | Ų | U | U+0173 | ų | u | U+0174 | Ŵ | W | U+0175 | ŵ | w | U+0176 | Ŷ | Y | U+0177 | ŷ | y | U+0178 | Ÿ | Y | U+0179 | Ź | Z | U+017A | ź | z | U+017B | Ż | Z | U+017C | ż | z | U+017D | Ž | Z | U+017E | ž | z | U+017F | ſ | s | U+01A0 | Ơ | O | U+01A1 | ơ | o | U+01AF | Ư | U | U+01B0 | ư | u | U+01CD | Ǎ | A | U+01CE | ǎ | a | U+01CF | Ǐ | I | U+01D0 | ǐ | i | U+01D1 | Ǒ | O | U+01D2 | ǒ | o | U+01D3 | Ǔ | U | U+01D4 | ǔ | u | U+01D5 | Ǖ | U | U+01D6 | ǖ | u | U+01D7 | Ǘ | U | U+01D8 | ǘ | u | U+01D9 | Ǚ | U | U+01DA | ǚ | u | U+01DB | Ǜ | U | U+01DC | ǜ | u Description |
| ———– | ————————————————- |
| Latin capital letter A with macron |
| Latin small letter a with macron |
| Latin capital letter A with breve |
| Latin small letter a with breve |
| Latin capital letter A with ogonek |
| Latin small letter a with ogonek |
| Latin capital letter C with acute |
| Latin small letter c with acute |
| Latin capital letter C with circumflex |
| Latin small letter c with circumflex |
| Latin capital letter C with dot above |
| Latin small letter c with dot above |
| Latin capital letter C with caron |
| Latin small letter c with caron |
| Latin capital letter D with caron |
| Latin small letter d with caron |
| Latin capital letter D with stroke |
| Latin small letter d with stroke |
| Latin capital letter E with macron |
| Latin small letter e with macron |
| Latin capital letter E with breve |
| Latin small letter e with breve |
| Latin capital letter E with dot above |
| Latin small letter e with dot above |
| Latin capital letter E with ogonek |
| Latin small letter e with ogonek |
| Latin capital letter E with caron |
| Latin small letter e with caron |
| Latin capital letter G with circumflex |
| Latin small letter g with circumflex |
| Latin capital letter G with breve |
| Latin small letter g with breve |
| Latin capital letter G with dot above |
| Latin small letter g with dot above |
| Latin capital letter G with cedilla |
| Latin small letter g with cedilla |
| Latin capital letter H with circumflex |
| Latin small letter h with circumflex |
| Latin capital letter H with stroke |
| Latin small letter h with stroke |
| Latin capital letter I with tilde |
| Latin small letter i with tilde |
| Latin capital letter I with macron |
| Latin small letter i with macron |
| Latin capital letter I with breve |
| Latin small letter i with breve |
| Latin capital letter I with ogonek |
| Latin small letter i with ogonek |
| Latin capital letter I with dot above |
| Latin small letter dotless i |
| Latin capital ligature IJ |
| Latin small ligature ij |
| Latin capital letter J with circumflex |
| Latin small letter j with circumflex |
| Latin capital letter K with cedilla |
| Latin small letter k with cedilla |
| Latin small letter Kra |
| Latin capital letter L with acute |
| Latin small letter l with acute |
| Latin capital letter L with cedilla |
| Latin small letter l with cedilla |
| Latin capital letter L with caron |
| Latin small letter l with caron |
| Latin capital letter L with middle dot |
| Latin small letter l with middle dot |
| Latin capital letter L with stroke |
| Latin small letter l with stroke |
| Latin capital letter N with acute |
| Latin small letter N with acute |
| Latin capital letter N with cedilla |
| Latin small letter n with cedilla |
| Latin capital letter N with caron |
| Latin small letter n with caron |
| Latin small letter n preceded by apostrophe |
| Latin capital letter Eng |
| Latin small letter Eng |
| Latin capital letter O with macron |
| Latin small letter o with macron |
| Latin capital letter O with breve |
| Latin small letter o with breve |
| Latin capital letter O with double acute |
| Latin small letter o with double acute |
| Latin capital ligature OE |
| Latin small ligature oe |
| Latin capital letter R with acute |
| Latin small letter r with acute |
| Latin capital letter R with cedilla |
| Latin small letter r with cedilla |
| Latin capital letter R with caron |
| Latin small letter r with caron |
| Latin capital letter S with acute |
| Latin small letter s with acute |
| Latin capital letter S with circumflex |
| Latin small letter s with circumflex |
| Latin capital letter S with cedilla |
| Latin small letter s with cedilla |
| Latin capital letter S with caron |
| Latin small letter s with caron |
| Latin capital letter T with cedilla |
| Latin small letter t with cedilla |
| Latin capital letter T with caron |
| Latin small letter t with caron |
| Latin capital letter T with stroke |
| Latin small letter t with stroke |
| Latin capital letter U with tilde |
| Latin small letter u with tilde |
| Latin capital letter U with macron |
| Latin small letter u with macron |
| Latin capital letter U with breve |
| Latin small letter u with breve |
| Latin capital letter U with ring above |
| Latin small letter u with ring above |
| Latin capital letter U with double acute |
| Latin small letter u with double acute |
| Latin capital letter U with ogonek |
| Latin small letter u with ogonek |
| Latin capital letter W with circumflex |
| Latin small letter w with circumflex |
| Latin capital letter Y with circumflex |
| Latin small letter y with circumflex |
| Latin capital letter Y with diaeresis |
| Latin capital letter Z with acute |
| Latin small letter z with acute |
| Latin capital letter Z with dot above |
| Latin small letter z with dot above |
| Latin capital letter Z with caron |
| Latin small letter z with caron |
| Latin small letter long s |
| Latin capital letter O with horn |
| Latin small letter o with horn |
| Latin capital letter U with horn |
| Latin small letter u with horn |
| Latin capital letter A with caron |
| Latin small letter a with caron |
| Latin capital letter I with caron |
| Latin small letter i with caron |
| Latin capital letter O with caron |
| Latin small letter o with caron |
| Latin capital letter U with caron |
| Latin small letter u with caron |
| Latin capital letter U with diaeresis and macron |
| Latin small letter u with diaeresis and macron |
| Latin capital letter U with diaeresis and acute |
| Latin small letter u with diaeresis and acute |
| Latin capital letter U with diaeresis and caron |
| Latin small letter u with diaeresis and caron |
| Latin capital letter U with diaeresis and grave |
| Latin small letter u with diaeresis and grave |

Decompositions for Latin Extended-B:

| Code | Glyph | Replacement | Description |
| ——– | —– | ———– | —————————————– |
| U+0218 | Ș | S | Latin capital letter S with comma below |
| U+0219 | ș | s | Latin small letter s with comma below |
| U+021A | Ț | T | Latin capital letter T with comma below |
| U+021B | ț | t | Latin small letter t with comma below |

Vowels with diacritic (Chinese, Hanyu Pinyin):

| Code | Glyph | Replacement | Description |
| ——– | —– | ———– | —————————————————– |
| U+0251 | ɑ | a | Latin small letter alpha |
| U+1EA0 | Ạ | A | Latin capital letter A with dot below |
| U+1EA1 | ạ | a | Latin small letter a with dot below |
| U+1EA2 | Ả | A | Latin capital letter A with hook above |
| U+1EA3 | ả | a | Latin small letter a with hook above |
| U+1EA4 | Ấ | A | Latin capital letter A with circumflex and acute |
| U+1EA5 | ấ | a | Latin small letter a with circumflex and acute |
| U+1EA6 | Ầ | A | Latin capital letter A with circumflex and grave |
| U+1EA7 | ầ | a | Latin small letter a with circumflex and grave |
| U+1EA8 | Ẩ | A | Latin capital letter A with circumflex and hook above |
| U+1EA9 | ẩ | a | Latin small letter a with circumflex and hook above |
| U+1EAA | Ẫ | A | Latin capital letter A with circumflex and tilde |
| U+1EAB | ẫ | a | Latin small letter a with circumflex and tilde |
| U+1EA6 | Ậ | A | Latin capital letter A with circumflex and dot below |
| U+1EAD | ậ | a | Latin small letter a with circumflex and dot below |
| U+1EAE | Ắ | A | Latin capital letter A with breve and acute |
| U+1EAF | ắ | a | Latin small letter a with breve and acute |
| U+1EB0 | Ằ | A | Latin capital letter A with breve and grave |
| U+1EB1 | ằ | a | Latin small letter a with breve and grave |
| U+1EB2 | Ẳ | A | Latin capital letter A with breve and hook above |
| U+1EB3 | ẳ | a | Latin small letter a with breve and hook above |
| U+1EB4 | Ẵ | A | Latin capital letter A with breve and tilde |
| U+1EB5 | ẵ | a | Latin small letter a with breve and tilde |
| U+1EB6 | Ặ | A | Latin capital letter A with breve and dot below |
| U+1EB7 | ặ | a | Latin small letter a with breve and dot below |
| U+1EB8 | Ẹ | E | Latin capital letter E with dot below |
| U+1EB9 | ẹ | e | Latin small letter e with dot below |
| U+1EBA | Ẻ | E | Latin capital letter E with hook above |
| U+1EBB | ẻ | e | Latin small letter e with hook above |
| U+1EBC | Ẽ | E | Latin capital letter E with tilde |
| U+1EBD | ẽ | e | Latin small letter e with tilde |
| U+1EBE | Ế | E | Latin capital letter E with circumflex and acute |
| U+1EBF | ế | e | Latin small letter e with circumflex and acute |
| U+1EC0 | Ề | E | Latin capital letter E with circumflex and grave |
| U+1EC1 | ề | e | Latin small letter e with circumflex and grave |
| U+1EC2 | Ể | E | Latin capital letter E with circumflex and hook above |
| U+1EC3 | ể | e | Latin small letter e with circumflex and hook above |
| U+1EC4 | Ễ | E | Latin capital letter E with circumflex and tilde |
| U+1EC5 | ễ | e | Latin small letter e with circumflex and tilde |
| U+1EC6 | Ệ | E | Latin capital letter E with circumflex and dot below |
| U+1EC7 | ệ | e | Latin small letter e with circumflex and dot below |
| U+1EC8 | Ỉ | I | Latin capital letter I with hook above |
| U+1EC9 | ỉ | i | Latin small letter i with hook above |
| U+1ECA | Ị | I | Latin capital letter I with dot below |
| U+1ECB | ị | i | Latin small letter i with dot below |
| U+1ECC | Ọ | O | Latin capital letter O with dot below |
| U+1ECD | ọ | o | Latin small letter o with dot below |
| U+1ECE | Ỏ | O | Latin capital letter O with hook above |
| U+1ECF | ỏ | o | Latin small letter o with hook above |
| U+1ED0 | Ố | O | Latin capital letter O with circumflex and acute |
| U+1ED1 | ố | o | Latin small letter o with circumflex and acute |
| U+1ED2 | Ồ | O | Latin capital letter O with circumflex and grave |
| U+1ED3 | ồ | o | Latin small letter o with circumflex and grave |
| U+1ED4 | Ổ | O | Latin capital letter O with circumflex and hook above |
| U+1ED5 | ổ | o | Latin small letter o with circumflex and hook above |
| U+1ED6 | Ỗ | O | Latin capital letter O with circumflex and tilde |
| U+1ED7 | ỗ | o | Latin small letter o with circumflex and tilde |
| U+1ED8 | Ộ | O | Latin capital letter O with circumflex and dot below |
| U+1ED9 | ộ | o | Latin small letter o with circumflex and dot below |
| U+1EDA | Ớ | O | Latin capital letter O with horn and acute |
| U+1EDB | ớ | o | Latin small letter o with horn and acute |
| U+1EDC | Ờ | O | Latin capital letter O with horn and grave |
| U+1EDD | ờ | o | Latin small letter o with horn and grave |
| U+1EDE | Ở | O | Latin capital letter O with horn and hook above |
| U+1EDF | ở | o | Latin small letter o with horn and hook above |
| U+1EE0 | Ỡ | O | Latin capital letter O with horn and tilde |
| U+1EE1 | ỡ | o | Latin small letter o with horn and tilde |
| U+1EE2 | Ợ | O | Latin capital letter O with horn and dot below |
| U+1EE3 | ợ | o | Latin small letter o with horn and dot below |
| U+1EE4 | Ụ | U | Latin capital letter U with dot below |
| U+1EE5 | ụ | u | Latin small letter u with dot below |
| U+1EE6 | Ủ | U | Latin capital letter U with hook above |
| U+1EE7 | ủ | u | Latin small letter u with hook above |
| U+1EE8 | Ứ | U | Latin capital letter U with horn and acute |
| U+1EE9 | ứ | u | Latin small letter u with horn and acute |
| U+1EEA | Ừ | U | Latin capital letter U with horn and grave |
| U+1EEB | ừ | u | Latin small letter u with horn and grave |
| U+1EEC | Ử | U | Latin capital letter U with horn and hook above |
| U+1EED | ử | u | Latin small letter u with horn and hook above |
| U+1EEE | Ữ | U | Latin capital letter U with horn and tilde |
| U+1EEF | ữ | u | Latin small letter u with horn and tilde |
| U+1EF0 | Ự | U | Latin capital letter U with horn and dot below |
| U+1EF1 | ự | u | Latin small letter u with horn and dot below |
| U+1EF2 | Ỳ | Y | Latin capital letter Y with grave |
| U+1EF3 | ỳ | y | Latin small letter y with grave |
| U+1EF4 | Ỵ | Y | Latin capital letter Y with dot below |
| U+1EF5 | ỵ | y | Latin small letter y with dot below |
| U+1EF6 | Ỷ | Y | Latin capital letter Y with hook above |
| U+1EF7 | ỷ | y | Latin small letter y with hook above |
| U+1EF8 | Ỹ | Y | Latin capital letter Y with tilde |
| U+1EF9 | ỹ | y | Latin small letter y with tilde |

German (`de_DE`), German formal (`de_DE_formal`), German (Switzerland) formal (`de_CH`),
German (Switzerland) informal (`de_CH_informal`), and German (Austria) (`de_AT`) locales:

| Code | Glyph | Replacement | Description |
| ——– | —– | ———– | ————————————— |
| U+00C4 | Ä | Ae | Latin capital letter A with diaeresis |
| U+00E4 | ä | ae | Latin small letter a with diaeresis |
| U+00D6 | Ö | Oe | Latin capital letter O with diaeresis |
| U+00F6 | ö | oe | Latin small letter o with diaeresis |
| U+00DC | Ü | Ue | Latin capital letter U with diaeresis |
| U+00FC | ü | ue | Latin small letter u with diaeresis |
| U+00DF | ß | ss | Latin small letter sharp s |

Danish (`da_DK`) locale:

| Code | Glyph | Replacement | Description |
| ——– | —– | ———– | ————————————— |
| U+00C6 | Æ | Ae | Latin capital letter AE |
| U+00E6 | æ | ae | Latin small letter ae |
| U+00D8 | Ø | Oe | Latin capital letter O with stroke |
| U+00F8 | ø | oe | Latin small letter o with stroke |
| U+00C5 | Å | Aa | Latin capital letter A with ring above |
| U+00E5 | å | aa | Latin small letter a with ring above |

Catalan (`ca`) locale:

| Code | Glyph | Replacement | Description |
| ——– | —– | ———– | ————————————— |
| U+00B7 | l·l | ll | Flown dot (between two Ls) |

Serbian (`sr_RS`) and Bosnian (`bs_BA`) locales:

| Code | Glyph | Replacement | Description |
| ——– | —– | ———– | ————————————— |
| U+0110 | Đ | DJ | Latin capital letter D with stroke |
| U+0111 | đ | dj | Latin small letter d with stroke |

function remove_accents( $string, $locale = '' ) {
	if ( ! preg_match( '/[x80-xff]/', $string ) ) {
		return $string;
	}

	if ( seems_utf8( $string ) ) {

		// Unicode sequence normalization from NFD (Normalization Form Decomposed)
		// to NFC (Normalization Form [Pre]Composed), the encoding used in this function.
		if ( function_exists( 'normalizer_normalize' ) ) {
			if ( ! normalizer_is_normalized( $string, Normalizer::FORM_C ) ) {
				$string = normalizer_normalize( $string, Normalizer::FORM_C );
			}
		}

		$chars = array(
			// Decompositions for Latin-1 Supplement.
			'ª' => 'a',
			'º' => 'o',
			'À' => 'A',
			'Á' => 'A',
			'Â' => 'A',
			'Ã' => 'A',
			'Ä' => 'A',
			'Å' => 'A',
			'Æ' => 'AE',
			'Ç' => 'C',
			'È' => 'E',
			'É' => 'E',
			'Ê' => 'E',
			'Ë' => 'E',
			'Ì' => 'I',
			'Í' => 'I',
			'Î' => 'I',
			'Ï' => 'I',
			'Ð' => 'D',
			'Ñ' => 'N',
			'Ò' => 'O',
			'Ó' => 'O',
			'Ô' => 'O',
			'Õ' => 'O',
			'Ö' => 'O',
			'Ù' => 'U',
			'Ú' => 'U',
			'Û' => 'U',
			'Ü' => 'U',
			'Ý' => 'Y',
			'Þ' => 'TH',
			'ß' => 's',
			'à' => 'a',
			'á' => 'a',
			'â' => 'a',
			'ã' => 'a',
			'ä' => 'a',
			'å' => 'a',
			'æ' => 'ae',
			'ç' => 'c',
			'è' => 'e',
			'é' => 'e',
			'ê' => 'e',
			'ë' => 'e',
			'ì' => 'i',
			'í' => 'i',
			'î' => 'i',
			'ï' => 'i',
			'ð' => 'd',
			'ñ' => 'n',
			'ò' => 'o',
			'ó' => 'o',
			'ô' => 'o',
			'õ' => 'o',
			'ö' => 'o',
			'ø' => 'o',
			'ù' => 'u',
			'ú' => 'u',
			'û' => 'u',
			'ü' => 'u',
			'ý' => 'y',
			'þ' => 'th',
			'ÿ' => 'y',
			'Ø' => 'O',
			// Decompositions for Latin Extended-A.
			'Ā' => 'A',
			'ā' => 'a',
			'Ă' => 'A',
			'ă' => 'a',
			'Ą' => 'A',
			'ą' => 'a',
			'Ć' => 'C',
			'ć' => 'c',
			'Ĉ' => 'C',
			'ĉ' => 'c',
			'Ċ' => 'C',
			'ċ' => 'c',
			'Č' => 'C',
			'č' => 'c',
			'Ď' => 'D',
			'ď' => 'd',
			'Đ' => 'D',
			'đ' => 'd',
			'Ē' => 'E',
			'ē' => 'e',
			'Ĕ' => 'E',
			'ĕ' => 'e',
			'Ė' => 'E',
			'ė' => 'e',
			'Ę' => 'E',
			'ę' => 'e',
			'Ě' => 'E',
			'ě' => 'e',
			'Ĝ' => 'G',
			'ĝ' => 'g',
			'Ğ' => 'G',
			'ğ' => 'g',
			'Ġ' => 'G',
			'ġ' => 'g',
			'Ģ' => 'G',
			'ģ' => 'g',
			'Ĥ' => 'H',
			'ĥ' => 'h',
			'Ħ' => 'H',
			'ħ' => 'h',
			'Ĩ' => 'I',
			'ĩ' => 'i',
			'Ī' => 'I',
			'ī' => 'i',
			'Ĭ' => 'I',
			'ĭ' => 'i',
			'Į' => 'I',
			'į' => 'i',
			'İ' => 'I',
			'ı' => 'i',
			'Ĳ' => 'IJ',
			'ĳ' => 'ij',
			'Ĵ' => 'J',
			'ĵ' => 'j',
			'Ķ' => 'K',
			'ķ' => 'k',
			'ĸ' => 'k',
			'Ĺ' => 'L',
			'ĺ' => 'l',
			'Ļ' => 'L',
			'ļ' => 'l',
			'Ľ' => 'L',
			'ľ' => 'l',
			'Ŀ' => 'L',
			'ŀ' => 'l',
			'Ł' => 'L',
			'ł' => 'l',
			'Ń' => 'N',
			'ń' => 'n',
			'Ņ' => 'N',
			'ņ' => 'n',
			'Ň' => 'N',
			'ň' => 'n',
			'ŉ' => 'n',
			'Ŋ' => 'N',
			'ŋ' => 'n',
			'Ō' => 'O',
			'ō' => 'o',
			'Ŏ' => 'O',
			'ŏ' => 'o',
			'Ő' => 'O',
			'ő' => 'o',
			'Œ' => 'OE',
			'œ' => 'oe',
			'Ŕ' => 'R',
			'ŕ' => 'r',
			'Ŗ' => 'R',
			'ŗ' => 'r',
			'Ř' => 'R',
			'ř' => 'r',
			'Ś' => 'S',
			'ś' => 's',
			'Ŝ' => 'S',
			'ŝ' => 's',
			'Ş' => 'S',
			'ş' => 's',
			'Š' => 'S',
			'š' => 's',
			'Ţ' => 'T',
			'ţ' => 't',
			'Ť' => 'T',
			'ť' => 't',
			'Ŧ' => 'T',
			'ŧ' => 't',
			'Ũ' => 'U',
			'ũ' => 'u',
			'Ū' => 'U',
			'ū' => 'u',
			'Ŭ' => 'U',
			'ŭ' => 'u',
			'Ů' => 'U',
			'ů' => 'u',
			'Ű' => 'U',
			'ű' => 'u',
			'Ų' => 'U',
			'ų' => 'u',
			'Ŵ' => 'W',
			'ŵ' => 'w',
			'Ŷ' => 'Y',
			'ŷ' => 'y',
			'Ÿ' => 'Y',
			'Ź' => 'Z',
			'ź' => 'z',
			'Ż' => 'Z',
			'ż' => 'z',
			'Ž' => 'Z',
			'ž' => 'z',
			'ſ' => 's',
			// Decompositions for Latin Extended-B.
			'Ș' => 'S',
			'ș' => 's',
			'Ț' => 'T',
			'ț' => 't',
			// Euro sign.
			'€' => 'E',
			// GBP (Pound) sign.
			'£' => '',
			// Vowels with diacritic (Vietnamese).
			// Unmarked.
			'Ơ' => 'O',
			'ơ' => 'o',
			'Ư' => 'U',
			'ư' => 'u',
			// Grave accent.
			'Ầ' => 'A',
			'ầ' => 'a',
			'Ằ' => 'A',
			'ằ' => 'a',
			'Ề' => 'E',
			'ề' => 'e',
			'Ồ' => 'O',
			'ồ' => 'o',
			'Ờ' => 'O',
			'ờ' => 'o',
			'Ừ' => 'U',
			'ừ' => 'u',
			'Ỳ' => 'Y',
			'ỳ' => 'y',
			// Hook.
			'Ả' => 'A',
			'ả' => 'a',
			'Ẩ' => 'A',
			'ẩ' => 'a',
			'Ẳ' => 'A',
			'ẳ' => 'a',
			'Ẻ' => 'E',
			'ẻ' => 'e',
			'Ể' => 'E',
			'ể' => 'e',
			'Ỉ' => 'I',
			'ỉ' => 'i',
			'Ỏ' => 'O',
			'ỏ' => 'o',
			'Ổ' => 'O',
			'ổ' => 'o',
			'Ở' => 'O',
			'ở' => 'o',
			'Ủ' => 'U',
			'ủ' => 'u',
			'Ử' => 'U',
			'ử' => 'u',
			'Ỷ' => 'Y',
			'ỷ' => 'y',
			// Tilde.
			'Ẫ' => 'A',
			'ẫ' => 'a',
			'Ẵ' => 'A',
			'ẵ' => 'a',
			'Ẽ' => 'E',
			'ẽ' => 'e',
			'Ễ' => 'E',
			'ễ' => 'e',
			'Ỗ' => 'O',
			'ỗ' => 'o',
			'Ỡ' => 'O',
			'ỡ' => 'o',
			'Ữ' => 'U',
			'ữ' => 'u',
			'Ỹ' => 'Y',
			'ỹ' => 'y',
			// Acute accent.
			'Ấ' => 'A',
			'ấ' => 'a',
			'Ắ' => 'A',
			'ắ' => 'a',
			'Ế' => 'E',
			'ế' => 'e',
			'Ố' => 'O',
			'ố' => 'o',
			'Ớ' => 'O',
			'ớ' => 'o',
			'Ứ' => 'U',
			'ứ' => 'u',
			// Dot below.
			'Ạ' => 'A',
			'ạ' => 'a',
			'Ậ' => 'A',
			'ậ' => 'a',
			'Ặ' => 'A',
			'ặ' => 'a',
			'Ẹ' => 'E',
			'ẹ' => 'e',
			'Ệ' => 'E',
			'ệ' => 'e',
			'Ị' => 'I',
			'ị' => 'i',
			'Ọ' => 'O',
			'ọ' => 'o',
			'Ộ' => 'O',
			'ộ' => 'o',
			'Ợ' => 'O',
			'ợ' => 'o',
			'Ụ' => 'U',
			'ụ' => 'u',
			'Ự' => 'U',
			'ự' => 'u',
			'Ỵ' => 'Y',
			'ỵ' => 'y',
			// Vowels with diacritic (Chinese, Hanyu Pinyin).
			'ɑ' => 'a',
			// Macron.
			'Ǖ' => 'U',
			'ǖ' => 'u',
			// Acute accent.
			'Ǘ' => 'U',
			'ǘ' => 'u',
			// Caron.
			'Ǎ' => 'A',
			'ǎ' => 'a',
			'Ǐ' => 'I',
			'ǐ' => 'i',
			'Ǒ' => 'O',
			'ǒ' => 'o',
			'Ǔ' => 'U',
			'ǔ' => 'u',
			'Ǚ' => 'U',
			'ǚ' => 'u',
			// Grave accent.
			'Ǜ' => 'U',
			'ǜ' => 'u',
		);

		// Used for locale-specific rules.
		if ( empty( $locale ) ) {
			$locale = get_locale();
		}

		/*
		 * German has various locales (de_DE, de_CH, de_AT, ...) with formal and informal variants.
		 * There is no 3-letter locale like 'def', so checking for 'de' instead of 'de_' is safe,
		 * since 'de' itself would be a valid locale too.
		 */
		if ( str_starts_with( $locale, 'de' ) ) {
			$chars['Ä'] = 'Ae';
			$chars['ä'] = 'ae';
			$chars['Ö'] = 'Oe';
			$chars['ö'] = 'oe';
			$chars['Ü'] = 'Ue';
			$chars['ü'] = 'ue';
			$chars['ß'] = 'ss';
		} elseif ( 'da_DK' === $locale ) {
			$chars['Æ'] = 'Ae';
			$chars['æ'] = 'ae';
			$chars['Ø'] = 'Oe';
			$chars['ø'] = 'oe';
			$chars['Å'] = 'Aa';
			$chars['å'] = 'aa';
		} elseif ( 'ca' === $locale ) {
			$chars['l·l'] = 'll';
		} elseif ( 'sr_RS' === $locale || 'bs_BA' === $locale ) {
			$chars['Đ'] = 'DJ';
			$chars['đ'] = 'dj';
		}

		$string = strtr( $string, $chars );
	} else {
		$chars = array();
		// Assume ISO-8859-1 if not UTF-8.
		$chars['in'] = "x80x83x8ax8ex9ax9e"
			. "x9fxa2xa5xb5xc0xc1xc2"
			. "xc3xc4xc5xc7xc8xc9xca"
			. "xcbxccxcdxcexcfxd1xd2"
			. "xd3xd4xd5xd6xd8xd9xda"
			. "xdbxdcxddxe0xe1xe2xe3"
			. "xe4xe5xe7xe8xe9xeaxeb"
			. "xecxedxeexefxf1xf2xf3"
			. "xf4xf5xf6xf8xf9xfaxfb"
			. "xfcxfdxff";

		$chars['out'] = 'EfSZszYcYuAAAAAACEEEEIIIINOOOOOOUUUUYaaaaaaceeeeiiiinoooooouuuuyy';

		$string              = strtr( $string, $chars['in'], $chars['out'] );
		$double_chars        = array();
		$double_chars['in']  = array( "x8c", "x9c", "xc6", "xd0", "xde", "xdf", "xe6", "xf0", "xfe" );
		$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;
}

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