Codeigniter min_length[] not working

I have this code:

$this->form_validation->set_rules('quadra_numero', 'Quadra número', 'required|trim|numeric|xss_clean|min_length[3]|max_length[3]|callback_valida_quadra_setor');

The max_length[3] works but not the min_length[3].

I've checked the returned value with strlen($quadra_numero) and it returns me 2 characters but the validation seems to ignore it.

In my form I have the number 091, in my database it is a VARCHAR to keep the 0 that is ne开发者_运维百科cessary.

If I post 0912 it will return the error for max_length but if I change it to 91 will pass the validation.

If I post 09 it will work, only with the 0(zero) is removed it won't work.

Any ideas?

Thanks in advance for any help.

--EDIT I have tried to use exact_length[8] and got the same results. The problem is with the 0(zero).

Just at a first glance, you probably need to typecast the variable to a string before sending it in.

$quadra_numero = (string)$quadra_numero; 

or

$quadra_numero = strval($quadra_numero);

and see if that takes care of the problem. The strlen is converting the variable to a string before it checks the length, but the validation probably isn't