Codeigniter MySQL update - mysql

Question

I have MySQL database used with Codigniter including following table too.
+-------------------+-----------------+------+-------+--------+
| update_request_id | update_stock_id | item | r_qty | status |
+-------------------+-----------------+------+-------+--------+
And used the following for loop in Controller, to update records in the table.
$count = count($this->input->post('item_id'));
$items = $this->input->post('item_id');
$qts = $this->input->post('qty');
for ($x = 0; $x < $count; $x++) {
$udetails[$x]['update_stock_id'] = $id;
$udetails[$x]['item'] = $items[$x];
$udetails[$x]['r_qty'] = $qts[$x];
$udetails[$x]['status'] = 1;
}
And the following View used to get relevant values for the controller.
<?php
if(!empty($itemReqFromHD)){
$newMaster=$itemReqFromHD[0];
}
?>
<script type="text/javascript">
$(document).on("change", "#item", function () {
$.ajax({
'url': '<?=site_url("item/isExistProduct/?q=")?>' + $('#item').val(),
'method': 'GET',
'success': function (data) {
//console.log(data);
var jData = JSON.parse(data);
if (jData.status == true) {
$('#request_table').append('<tr>' +
'<td ><span id="product" >' + jData.data[0].item_name + '</span>' +
'<input type="hidden" id="item_id[]" name="item_id[]" value="'+jData.data[0].item_id+'">' +
'</td>' +
'<td class="text-center"><input class="form-control" autofocus required type="number" step="any" id="qty['+jData.data[0].item_id+']" name="qty['+jData.data[0].item_id+']" ></td>' +
'<td class="text-center" ><i class="fa fa-remove remove" style="cursor: pointer"></i></td>' +
'</tr>');
}
},
'error': function () {
}
});
});
$(document).on("click", ".remove", function () {
$(this).closest('tr').remove();
});
</script>
<div class="box box-info">
<div class="box box-info collapsed-box">
<div class="box-header with-border">
<h3 class="box-title">Update Item Request From HD</h3>
<div class="box-tools pull-right">
<button type="button" class="btn btn-box-tool" style="font-size: 16px;" data-widget="collapse"><i
class="fa fa-plus"></i>
</button>
</div>
<!-- /.box-tools -->
</div>
<!-- /.box-header -->
<div class="box-body" style="display: block">
<form action="<?= site_url('item/editItemReqFromHD/'.$newMaster->update_stock_id) ?>" method="post">
<div class="row">
<div class="col-md-3">
<div class="form-group"><label>Request Date</label>
<input type="date" name="request_date" id="request_date" class="form-control" value="<?=$newMaster->billed_date?>">
</div>
</div>
<div class="col-md-6">
<div class="form-group"><label>Select Product</label>
<select name="item" id="item" class="form-control select2" >
<option value="">Select Product</option>
<?php
if (!empty($products)) {
foreach ($products as $row) {
?>
<option value="<?= $row->item_id ?>"><?= $row->item_name ?></option>
<?php
}
}
?>
</select>
</div>
</div>
</div>
<!--table-->
<div class="col-md-12 column">
<div class="col-md-12">
<div class="control-group table-group">
<label class="table-label">Request Items *</label>
<div class="controls table-controls">
<table id="request_table"
class="table items table-striped table-bordered table-condensed table-hover">
<thead>
<tr style="background-color: #3c8dbc">
<th class="col-md-8">Product Name</th>
<th class="text-center" class="col-md-2">Quantity</th>
</th>
<th style="width: 30px !important; text-align: center;">
<i class="fa fa-trash-o" style="opacity:0.5; filter:alpha(opacity=50);"></i>
</th>
</tr>
</thead>
<tbody>
<?php
foreach ($itemReqFromHD as $row){
?>
<tr>
<td ><?=$row->item_name?>
<input type="hidden" id="item_id[]" name="item_id[]" value="<?=$row->item_id?>">
</td>
<td class="text-center"><input class="form-control" value="<?=$row->r_qty?>" required type="number" step="any" id="r_qty[<?=$row->item_id?>]" name="r_qty[<?=$row->item_id?>]" ></td>
<td class="text-center"><i class="fa fa-remove remove" style="cursor: pointer"></i></td>
</tr>
<?php
}
?>
</tbody>
</table>
</div>
</div>
</div>
</div>
<div class="row">
<div class="col-md-8"></div>
<div class="col-md-4">
<button type="submit" class="btn btn-primary btn-block">Update Request</button>
</div>
</div>
</form>
</div>
</div>
</div>
All codes are working fine but at the time of the update the column 'r_qty' is not edited, leaving the table as follows:
Array
(
[0] => Array
(
[update_stock_id] => 577
[item] => 2
[r_qty] =>
[status] => 1
)
[1] => Array
(
[update_stock_id] => 577
[item] => 4
[r_qty] =>
[status] => 1
)
)
I could not catch what I am going wrong ? Can anyone help me ?