foreach problem

//i am using codeigniter

//my view file is

<p class="scent">
        <label for="test">Test </label>
        <?php echo form_dropdown('test[]', $dropdown, set_value('test[]'))?>
        <a href="" class="addScnt">Add</a>
        <a href="" class="remScnt">Remove</a>
        <?php echo form_error('test'); ?><span class="required"></span>
</p>

//controller


        if ($this->form_validation->run() == FALSE) // validation hasn't been passed
        {
            $this->load->view('admission',$data);
        }
        else // passed validation proceed to post success logic
        {
            // build array for the model

            $form_data = array(
                            'pname' => set_value('pname'),
                            'pid' => set_value('pid'),
                            'age' => set_value('age'),
                            'gender' => set_value('gender'),
                            'refdby' => set_value('refdby'),
                            'client' => set_value('client'),
                            'test[]' => set_value('test[]')
                        );

            //run insert model to write data to db
            foreach ($this->input->post('test') as $test) {

             //$test_value=$test;
             $pname= $this->input->post('pname');
             $pid= $this->input->post('pid');
             $age= $this->input->post('age');
             $gender=$this->input->post('gender');
             $refdby=$this->input->post('refdby');
             $client=$this->input->post('client');

             $this->myform_model->insert_data($pname,$pid,$age,$gender,$refdby,$client,$test);

             }
    }
//model

  public function insert_data($pname,$pid,$age,$gender,$refdby,$client,$test){

        $query="INSERT INTO patient (pname,pid,age,gender,refdby,client,test) VALUES (?,?,?,?,?,?,?)";
        $this->db->query($query,array($pname,$pid,$age,$gender,$refdby,$client,$test));

        redirect('welcome');
      }