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Codeigniter uses a validation callback to change the presented value

I have text input where users send CSV, for example. red, blue, red, yellow

If the user sends duplicate values, for example, redas shown above, I want to remove the duplicate. I started making a callback, but I'm not sure how to complete it.

    //callback rule
    function _remove_dublicate($str) 
    {
            $val = strtolower($str); //make everything lowercase
            $colors = str_getcsv($val); //create array                          
            $result = array_unique($colors); //remove duplicates

    }

If there are duplicates, what should I do to send a new row from $resultto the database?

Below is my validation form

$this->form_validation->set_rules('colors', 'Colors', 'trim|required|xss_clean|regex_match[/^[a-z, ]+$/i]|callback__remove_dublicate');


        if ($this->form_validation->run() == FALSE) //if validation rules fail
        {           
            $this->load->view('edit/form');
        }
        else //success
        {
            $data = array (
                'colors' => $this->input->post('colors')
            );          
            $this->My_model->colors_update($data);          
        }

EDIT

based on Cabaret suggestion I added this to the operator elseto remove dublicates

$colors = str_getcsv($this->input->post('colors')); //create array
$result = array_unique($colors); //remove duplicates
$comma_separated = implode(",", $result); //add back CSV string

$data = array (
    'colors' => $comma_separated
);

It seems to work

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2 answers

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//callback rule
function _remove_duplicate($str = '') 
{
    $val = strtolower($str); //make everything lowercase
    $colors = str_getcsv($val); //create array 
    // you could also use explode(',', $colors)
    // if you aren't expecting other delimiters than a comma
    // i.e. no commas within quotes                         
    $result = array_unique($colors); //remove duplicates
    $result = implode(',', $result); // back to string value
    return $result; // Return the value to alter the input
}

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$this->form_validation->set_rules('password', 'Password', 'trim|required|matches[passconf]|md5');
$this->form_validation->set_rules('passconf', 'Password Confirmation', 'trim|required');
$this->form_validation->set_rules('email', 'Email', 'trim|required|valid_email');

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+2
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