Please help about Codeigniter, about sales input - php

Question

this models M_penjualan.php
function simpan_penjualan($nofak,$total,$jml_uang,$kembalian){
$idadmin=$this->session->userdata('idadmin');
$this->db->query("INSERT INTO tbl_jual (jual_nofak,jual_total,jual_jml_uang,jual_kembalian,jual_user_id,jual_keterangan) VALUES ('$nofak','$total','$jml_uang','$kembalian','$idadmin','eceran')");
foreach ($this->cart->contents() as $item) {
$data=array(
'd_jual_nofak' => $nofak,
'd_jual_barang_id' => $item['id'],
'd_jual_barang_nama' => $item['name'],
'd_jual_barang_satuan' => $item['satuan'],
'd_jual_barang_harpok' => $item['harpok'],
'd_jual_barang_harjul' => $item['amount'],
'd_jual_qty' => $item['qty'],
'd_jual_diskon' => $item['disc'],
'd_jual_total' => $item['subtotal']
);
$this->db->insert('tbl_detail_jual',$data);
$this->db->query("update tbl_barang set barang_stok=barang_stok-'$item[qty]' where barang_id='$item[id]'");
}
return true;
this class CI_Controller Penjualan.php
function add_to_cart(){
if($this->session->userdata('akses')=='1' || $this->session->userdata('akses')=='2'){
$kobar=$this->input->post('kode_brg');
$produk=$this->m_barang->get_barang($kobar);
$i=$produk->row_array();
$data = array(
'id' => $i['barang_id'],
'name' => $i['barang_nama'],
'satuan' => $i['barang_satuan'],
'harpok' => $i['barang_harpok'],
'price' => str_replace(",", "", $this->input->post('harjul'))-$this->input->post('diskon'),
'disc' => $this->input->post('diskon'),
'qty' => $this->input->post('qty'),
'amount' => str_replace(",", "", $this->input->post('harjul'))
);
if(!empty($this->cart->total_items())){
foreach ($this->cart->contents() as $items){
$id=$items['id'];
$qtylama=$items['qty'];
$rowid=$items['rowid'];
$kobar=$this->input->post('kode_brg');
$qty=$this->input->post('qty');
if($id==$kobar){
$up=array(
'rowid'=> $rowid,
'qty'=>$qtylama+$qty
);
$this->cart->update($up);
}else{
$this->cart->insert($data);
}
}
}else{
$this->cart->insert($data);
}
the latter view v_penjualan.php
<?php $i = 1;?>
<?php foreach ($this->cart->contents() as $items): ?>
<?php echo form_hidden($i.'[rowid]', $items['rowid']); ?>
<tr>
<td><?=$items['id'];?></td>
<td><?=$items['name'];?></td>
<td><?=$items['satuan'];?></td>
<td><?php echo number_format($items['amount']);?></td>
<td><?php echo number_format($items['disc']);?></td>
<td><?php echo number_format($items['qty']);?></td>
<td><?php echo number_format($items['subtotal']);?></td>
<td class="text-center"><span class="far fa-trash-alt mr-2"></span> Hapus</td>
</tr>
<?php $i++; ?>
<?php endforeach; ?>
in the above code when inputting and leads to add_cart "$rowid=$items['rowid'];" which is displayed Only 6 Rows, I can't add to the 7th input and so on, please help, is there any missing code? thanks for the help.