i can't post string %10 to %19 by a form field by a form using post method

I had the same problem and I found it's a bug that was fixed in 3.0 but not in 2.2 : https://github.com/EllisLab/CodeIgniter/...45e5cfd39c

In the file system/core/Input.php, in _clean_input_data(), add FALSE as a second parameter to remove_invisible_characters:

PHP Code:

// Remove control characters
$str = remove_invisible_characters($str, FALSE);