Form Validation on Array name fields - Codeigniter - codeigniter

Question

I have a dynamic form to add rows. The form lets the users to add transactions and submit it. I want to validate only the transaction numbers before inserting them into DB. I have to check
If the transaction field is empty or not
If the transaction already exists in the transactions table (if yes : display message transaction already exists. Please remove row. If no: proceed to DB insertion)
View part:
<div class="row">
<div class="col-md-12 ">
<?php echo validation_errors(); ?>
<?php
echo form_error("Transaction_number[]");
?>
<?php echo form_open('payment_refund/refund_form/'); ?>
<script src="https://code.jquery.com/jquery-3.6.0.min.js" integrity="sha256-/xUj+3OJU5yExlq6GSYGSHk7tPXikynS7ogEvDej/m4=" crossorigin="anonymous"></script>
<table id='tbl' class="table table-bordered table-hover table-striped">
<thead>
<tr>
<th>Transaction_number</th>
<th>Order_number</th>
<th>Amount_paid</th>
<th>Transaction_date</th>
<th>Remove</th>
</tr>
</thead>
<tbody>
<tr>
<td><input type='text' name='Transaction_number[]' value="<?php echo set_value('Transaction_number[]'); ?>" /></td>
<td><input type='text' name='Order_number[]' value="<?php echo set_value('Order_number[]'); ?>" /></td>
<td><input type='number' name='Amount_paid[]' value="<?php echo set_value('Amount_paid[]'); ?>" /></td>
<td><input type='date' name='Transaction_date[]' value="<?php echo set_value('Transaction_date[]'); ?>" /></td>
<td><input type='button' value='Remove' class='rmv'></td>
</tr>
</tbody>
<tfoot>
<tr>
<td colspan='3'><input type='button' value='+Add Row' id='add_row'></td>
</tr>
</tfoot>
</table>
<script>
$(document).ready(function(){
$("#add_row").click(function(){
var row="<tr> <td><input type='text' name='Transaction_number[]'></td> <td><input type='text' name='Order_number[]'></td> <td><input type='number' name='Amount_paid[]'></td> <td><input type='date' name='Transaction_date[]'></td> <td><input type='button' value='Remove' class='rmv'></td> </tr>";
$("#tbl tbody").append(row);
});
$("body").on("click",".rmv",function(){
$(this).closest("tr").remove();
});
});
</script>
<!-- Insert a check to see if any transaction details are entered before submit -->
<input type="submit" name="submit" id="submit" value="submit" class="btn btn-primary" >
<?php echo form_close(); ?>
</div>
Controller Part:
class Refund_form extends MY_Controller
{
public function __construct()
{
parent::__construct(array('stu'));
$this->load->model('payment_refund/refund_form_model','',TRUE);
}
public function index()
{
$this->load->helper('form');
$this->load->helper(array('form', 'url'));
$this->load->helper('array');
$this->load->library('form_validation');
$Transaction_number = $this->input->post('Transaction_number');
for($i = 0; $i < count($Transaction_number); $i++)
{
$tran = $Transaction_number[$i];
$this->load->library('form_validation');
$this->form_validation->set_rules($tran, 'Transaction', 'required');
}
if ($this->form_validation->run() == TRUE)
{
echo "All went well <br/>"; // insertion into DB for all table data fetched from view is done here
}
else
{
echo "All is NOT well <br/>";
}
public function add()
{
$this->drawHeader("Refund form - Add");
$this->load->view('payment_refund/refund_form_view');
$this->drawFooter();
}
Other methods that i tried to validate the form
`$formrules = array(
array(
'field' => 'Transaction_number[]',
'label' => 'the transsaction field',
'rules' => 'required'
),
);
$this->form_validation->set_rules($formrules);
if ($this->form_validation->run() == true)
{return true; } //DB insertion
else
{ return false; } `
DB insertion is done as below
for($i=0;$i<count($Transaction_number);$i++){
$data[] = [
'tracking_id' => $tracking_id,
'trans_id' => $Transaction_number[$i],
'order_id' => $Order_number[$i],
'amount' => $Amount_paid[$i],
'date_of_trans' => $Transaction_date[$i],
];
}
//inser_batch
$response=$this->db->insert_batch('refund_transaction_details',$data);
if($response==true){
echo "Records Saved Successfully";
}
else{
echo "Insert error !";
}