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// A simple multibyte-safe case-insensitive string comparison:

function mb_strcasecmp($str1, $str2, $encoding = null) {
  if (null === $encoding) { $encoding = mb_internal_encoding(); }
  return strcmp(mb_strtoupper($str1, $encoding), mb_strtoupper($str2, $encoding));
}

// http://php.net/manual/ru/function.strcasecmp.php