how to validate array value in codeigniter

Question

I have in my form work experience which is added dynamically with input as organisation name, department name, position and duration.

Answer 1

So as suggested by @ Hashem Qolami I did the following changes in my code and it worked.

$organization    = $this->input->post('organization');
$department      = $this->input->post('department');
$positions       = $this->input->post('positions');
$duration        = $this->input->post('duration');

foreach($organization as $ind=>$val) 
{
    $org  = $organization[$ind];
    $dept = $department[$ind];
    $pos  = $positions[$ind];
    $dura = $duration[$ind];

    $this->form_validation->set_rules("organization[".$ind."]", "Organization", "trim|xss_clean|max_length[1]");
    $this->form_validation->set_rules("department[".$ind."]", "Department", "trim|xss_clean|max_length[50]");
    $this->form_validation->set_rules("positions[".$ind."]", "Position", "trim|xss_clean|max_length[40]");
    if(!empty($dura))
       $this->form_validation->set_rules("duration[".$ind."]", "Duration", "trim|xss_clean|integer");
}

and displayed my errors as follows

 for($i = 0; $i < count($organization); $i++) {
     echo form_error("organization[".$i."]"); 
     echo form_error("department[".$i."]"); 
     echo form_error("positions[".$i."]"); 
     echo form_error("duration[".$i."]");
  }

Answer 2

It doesn't let me submit the form If so, It sounds like a bug.

Temporarily, you can check whether duration[] array is empty or not:

if (! empty($_POST['duration'])) {
    $this->form_validation->set_rules('duration[]',"Duration", "trim|xss_clean|numeric");
}

I'll update my answer if I found the main solution.

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Update: This is a bug as I expected, I opened a PR at CodeIgniter Repository, that would fix this issue.