How to Insert Arrays (Multiple rows) into Mysql using Codeigniter?

i have search alot and i have post somany times but i didnt get any proper answer.

This is my view page - View

here i have write a query for add fields dynamically for particular ref_no so help me for model and controller

<div id="login_form">
        <?php echo form_open(base_url().'sample/invoice'); ?>
        <label for="type" class="control-label">Type</label>
        <div><?php echo form_input(array('id'=>'type','name'=>'type'));?></div>

        <label for="ref" class="control-label">REF</label>
        <div><?php echo form_input(array('id'=>'ref','name'=>'ref'));?></div>

        <label for="title" class="control-label">TITLE</label>
        <div><?php echo form_input(array('id'=>'title','name'=>'title'));?></div>

        <div  id="description"><p id="add_field">ADD DESCRIPTION</p></div>

        <label for="doc" class="control-label">Support Doc</label>
        <div><?php echo form_input(array('id'=>'doc','name'=>'attach','type'=>"file"));?></div>

        <input id="btn_add" name="btn_add" type="submit" class="btn btn-primary" value="Save" />
    </div>
<script>
            var count = 0;
    $(document).ready(function() {
        $('p#add_field').click(function(){
           count += 1;
            var html='<strong>Description  '+ count +'</strong>'+'<input id="description'+ count +'"name="description[]'+'" type="text" />'+'<input id="description'+ count +'"name="voucher_no[]'+'" type="text" />'+'<input id="description'+ count +'"name="price[]'+'" type="text" /><br />';
            $('#description').append(html);

    });
    });

        </script>

This is My Controller :

$data1 = array(
                  'invoice_type' => $this->input->post('type'),
                  'reference_no' => $this->input->post('ref'),
                  'des_title' => $this->input->post('title'),


                  );

    $data2 = array(
                    'reference_no' => $this->input->post('ref'),
                    'description' => $this->input->post('des'),
                    ); 
 $this->sample_model->insert_entry($data1, $data2);

This My MOdel :

function insert_entry($data1, $data2) {

        $this->db->insert('myinvoice', $data1);
        $this->db->insert('invoice_description', $data2);

}

What i want is insert mutiple descriptions for one reference number. myinvoice is parent table and invoice_description is child table when i insert single data its works perfectly but i want insert multiple descriptions

via Chebli Mohamed