function similar_check ($str1, $str2) {

    $str1_len = mb_strlen($str1, 'UTF-8');
    $str2_len = mb_strlen($str2, 'UTF-8');

    if ($str1_len > $str2_len) {
        $big_str = $str1;
        $small_str = $str2;
    }
    else {
        $big_str = $str2;
        $small_str = $str1;
    }

    $big_arr = explode (chr(32), $big_str);
    $small_arr = explode (chr(32), $small_str);
    $big_count = count ($big_arr);
    $small_count = count ($small_arr);

}