Defining Callback function in codeigniter

Question

I am trying to set error validation for strn and is needed to follow this strict rule,but as I am unaware of how to use callback functionality, can anybody help me in setting up the form validation for the same?

$this->form_validation->set_rules('strn', 'STRN', 'trim|callback_strn_check');

and the strict rules are:-

The STRN is a unique 15 digit number.
1st ten digits are PAN number of the Assessee
11th & 12th is the Service Tax Code (Its is either ST or SD)

One more important point is that this field is not mandatory, yet if user fills it inappropriately, then he should receive a form error.

Niranjan N Raju · Accepted Answer · 2015-11-03 12:22:58Z

1

try this,

$this->form_validation->set_rules('strn', 'STRN','trim|max_length[15]|min_length[15]callback_strn_check');


function strn_check($num){
    if(strlen($num) != 15){
        return false;
    } else if(substr($num, -2) == "SD" || substr($num, -2) == "ST") {
        $ten = substr($num, 0, 10);
        if(ctype_digit($ten))
            return true;
        return false;
    } else {
        return false;
    }
}

EDIT

For the first 10 characters to be same as pan you can do like this,

function strn_check($num){
    if(strlen($num) != 15){
        return false;
    } else if(substr($num, -2) == "SD" || substr($num, -2) == "ST") {
        $ten = substr($num, 0, 10);
        if($this->input->post("pan") == $ten)
            return true;
        return false;
    } else {
        return false;
    }
}

If you want you can use strtolower(), if case doesnt have any influence in validation. As of now, it will work only for uppercase letters(last 2 characters).

edited Nov 3, 2015 at 12:22

answered Nov 3, 2015 at 12:00

Niranjan N Raju

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5 Comments

Ajitej Kaushik Over a year ago

and what about the first ten digits to be same as PAN which is also an input from the user?

Niranjan N Raju Over a year ago

all characters shud be same?? or all characters shud be digits??

Ajitej Kaushik Over a year ago

that should be exactly the same as the one entered in pan code:- $pan = $this->input->post('pan'); used in controller

Niranjan N Raju Over a year ago

you can use matches a default in form validation

Niranjan N Raju Over a year ago

if you want first 10 characters to be digits, check my updated answer

Ajitej Kaushik · Accepted Answer · 2015-11-04 05:56:44Z

0

i tried the answer given above and fixed few bugs,now its working absolutely perfect. here is the code:-

function strn_check($num)
{
    if($num != "")
    {
        if(strlen($num) != 15)
        {
            return false;
        } 
        else if(substr($num, 10,12) != "SD" || substr($num, 10,12) != "ST") 
        {
            $ten = substr($num, 0, 10);
            if($this->input->post("pan") != $ten)
            return false;
        }
        else 
        {
            return false;
        }
    }
    else
    {
        return true;
    }
}

answered Nov 4, 2015 at 5:56

Ajitej Kaushik

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