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<?php |
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/* |
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consider decomposing the characters to "capture" more "obscure" characters such as ṩ |
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- http://www.php.net/manual/en/normalizer.normalize.php#92592 |
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*/ |
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/** |
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* Normalize a string to only contain alphanumeric characters and dashes. |
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* |
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* Replace accents by their entities. |
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* Replace everything else by - (dash). |
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* @note mb_internal_charset() must be set to whatever encoding $string had originally |
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* @param string $string String to normalize |
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* @param boolean $trim Trim string to not start/end with a dash and not contain dash sequences |
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* @param array|string $allow List of Characters that are to be ignored while urlifying array( unicode => true ) or string like "$é@" |
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* @param array $replace List of Characters that are to be replaced while urlifying array( unicode => "character" ) |
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* @return string normalized string |
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* @author Christian Kruse <cjk+os@wwwtech.de> |
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* @author Rodney Rehm <rodney.rehm@medialize.de> |
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*/ |
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function urlify($string, $trim=true, $allow=null, $replace=null) |
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{ |
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if (!is_string($string)) { |
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throw new Exception('$string must be a string'); |
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} |
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$_replace = array( |
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0xE4 => "\0\0\0\x61\0\0\0\x65", // ä |
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0xC4 => "\0\0\0\x41\0\0\0\x65", // Ä |
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0xF6 => "\0\0\0\x6F\0\0\0\x65", // ö |
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0xD6 => "\0\0\0\x4F\0\0\0\x65", // Ö |
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0xFC => "\0\0\0\x75\0\0\0\x65", // ü |
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0xDC => "\0\0\0\x55\0\0\0\x65", // Ü |
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0xDF => "\0\0\0\x73\0\0\0\x73", // ß |
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0xE6 => "\0\0\0\x61\0\0\0\x65", // æ |
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0xC6 => "\0\0\0\x41\0\0\0\x65", // Æ |
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); |
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if ($replace && is_array($replace)) { |
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foreach ($replace as $k => $v) { |
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$_replace[$k] = mb_convert_encoding($v, "UTF-32BE"); |
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} |
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} |
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if ($allow && is_string($allow)) { |
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$t = mb_convert_encoding($allow, "UTF-32BE"); |
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$t = unpack("N*", $t); |
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$allow = array(); |
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foreach ($t as $k) { |
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$allow[$k] = true; |
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} |
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} elseif ($allow && !is_array($allow)) { |
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$allow = null; |
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} |
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$res = ''; |
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$string = mb_convert_encoding($string, "UTF-32BE"); |
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$unicodes = unpack("N*", $string); |
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$i = -1; |
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foreach ($unicodes as $code) { |
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$i++; |
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if (($code >= 97 && $code <= 122) || ($code >= 65 && $code <= 90) || ($code >= 48 && $code <= 57) || $code == 95 || $code == 45) { |
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// skip normalization for alphanumeric characters [a-zA-Z0-9_-] |
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$res .= mb_substr($string, $i, 1, "UTF-32BE"); |
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} elseif ($allow && isset($allow[$code])) { |
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// skip normalization for allowed characters |
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$res .= mb_substr($string, $i, 1, "UTF-32BE"); |
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} elseif (isset($_replace[$code])) { |
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// replace as defined |
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$res .= $_replace[$code]; |
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} elseif (($code >= 0xC0 && $code <= 0xC6) || ($code >= 0xE0 && $code <= 0xE6) || ($code >= 0x100 && $code <= 0x105)) { |
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$res .= "\0\0\0\x61"; // a |
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} elseif ($code == 0xC7 || $code == 0xE7 || ($code >= 0x106 && $code <= 0x10D)) { |
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$res .= "\0\0\0\x63"; // c |
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} elseif ($code == 0xD0 || ($code >= 0x10E && $code <= 0x111)) { |
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$res .= "\0\0\0\x64"; // d |
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} elseif (($code >= 0xC8 && $code <= 0xCB) || ($code >= 0xE8 && $code <= 0xEB) || ($code >= 0x112 && $code <= 0x11B)) { |
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$res .= "\0\0\0\x65"; // e |
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} elseif (($code >= 0xCC && $code <= 0xCF) || ($code >= 0xEC && $code <= 0xEF)) { |
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$res .= "\0\0\0\x69"; // i |
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} elseif ($code == 0xD1 || $code == 0xF1) { |
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$res .= "\0\0\0\x6E"; // n |
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} elseif (($code >= 0xD2 && $code <= 0xD8) || ($code >= 0xF2 && $code <= 0xF8)) { |
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$res .= "\0\0\0\x6F"; // o |
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} elseif (($code >= 0xD9 && $code <= 0xDB) || ($code >= 0xF9 && $code <= 0xFB)) { |
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$res .= "\0\0\0\x75"; // u |
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} elseif ($code == 0xDD || $code == 0xFD || $code == 0xFF) { |
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$res .= "\0\0\0\x79"; // y |
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} else { |
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$res .= "\0\0\0\x2D"; // - |
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} |
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} |
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if ($trim) { |
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$res = preg_replace('#(\0\0\0\x2D){2,}#', "\0\0\0\x2D", $res); |
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$res = preg_replace('#(^\0\0\0\x2D)|(\0\0\0\x2D$)#', "", $res); |
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} |
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return mb_convert_encoding($res, mb_internal_encoding(), "UTF-32BE"); |
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} |
