PHP функция mb_ucfirst

if(!function_exists('mb_ucfirst')) {
function mb_ucfirst($str, $enc = 'utf-8') {
return mb_strtoupper(mb_substr($str, 0, 1, $enc), $enc).mb_substr($str, 1, mb_strlen($str, $enc), $enc);
}
}

$str = 'русский text!';
$str = mb_ucfirst($str);
echo $str;