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private function lowercase($s) {
$chars_hi = utf8_encode('ABCDEFGHIJKLMNOPQRSTUVWXYZАБВГДЕЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯЁ');
$chars_lo = utf8_encode('abcdefghijklmnopqrstuvwxyzабвгдежзийклмнопрстуфхцчшщъыьэюяё');
return strtr($s, $chars_hi, $chars_lo);
}