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<?php class HIPAY_MAPI_UTF8 { /** * Test si une chaine est en UTF-8 * * @param string $string * @return boolean */ public static function is_utf8($string) { // From http://w3.org/International/questions/qa-forms-utf-8.html return preg_match('%^(?: [\x09\x0A\x0D\x20-\x7E] # ASCII | [\xC2-\xDF][\x80-\xBF] # non-overlong 2-byte | \xE0[\xA0-\xBF][\x80-\xBF] # excluding overlongs | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2} # straight 3-byte | \xED[\x80-\x9F][\x80-\xBF] # excluding surrogates | \xF0[\x90-\xBF][\x80-\xBF]{2} # planes 1-3 | [\xF1-\xF3][\x80-\xBF]{3} # planes 4-15 | \xF4[\x80-\x8F][\x80-\xBF]{2} # plane 16 )*$%xs', $string); } /** * Encode une chaine en UTF-8 si elle ne l'est pas déjà * * @param string $string * @return string */ public static function forceUTF8($string) { if (!self::is_utf8($string)) return utf8_encode($string); else return $string; } /** * Longueur d'une chaine UTF-8 * * @param string $str * @return int longueur de la chaine */ public static function strlen_utf8 ($str) { $i = 0; $count = 0; $len = strlen ($str); while ($i < $len) { $chr = ord($str[$i]); $count++; $i++; if ($i >= $len) break; if ($chr & 0x80) { $chr <<= 1; while ($chr & 0x80) { $i++; $chr <<= 1; } } } return $count; } }
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