Only variables should be passed by reference, database/DB_active_rec.php - php

Question

I am new to codeigniter, I just want to ask how to get rid with this thing
A PHP Error was encountered
Severity: Notice
Message: Only variables should be passed by reference
Filename: database/DB_active_rec.php
Line Number: 225
I dont know why, this suddenly comes out, but my page is doing fine, but this is at the top of my page, how to get rid of this thing, this is what i have:
Pages_Controller:
public function clients_ordered_products($id){
if(isset($_SESSION["id"])){
if($_SESSION["Usertype"]==1){
$this->load->view('admin/header');
$this->load->view('title/title_admin');
$this->load->view('admin/navigation');
$this->data["posts"] = $this->Generate_Model->getProductsClientsOrdered($id);
$this->load->view('admin/clients_ordered_products',$this->data);
$this->load->view('admin/footer');
}
else if($_SESSION["Usertype"]==0){
redirect('Pages_Controller/Ooops_Client');
}
}
else{
redirect($url);
}
}
and
Generate_Model:
public function getProductsClientsOrdered($id){
$this->db->select('*');
$this->db->select_sum('tbl_product_selected.Quantity');
$this->db->from('tbl_product_selected');
$this->db->join('tbl_product','tbl_product.Product_ID = tbl_product_selected.Product_ID');
$this->db->where('Account_ID',$id);
$this->db->where('Purchase_time',NULL);
$this->db->where('Active',1);
$this->db->group_by('tbl_product_selected.Product_ID');
$query = $this->db->get();
return $query->result();
}
and
<div id="page-wrapper">
<div class="cart">
<div class="container">
<div class="col-md-9 cart-items">
<!-- /.panel-heading -->
<div class="panel-body">
<table id="cart" class="table table-hover table-responsive">
<thead>
<tr>
<th>Product Name</th>
<th>Price</th>
<th>Quantity</th>
<th class="text-center">Subtotal</th>
<th>Action</th>
</tr>
</thead>
<?php $total = 0; ?>
<?php foreach($posts as $post){ ?>
<form action="<?php echo base_url(); ?>index.php/Transaction_Controller/removeItem/<?php echo $post->Product_selected_id; ?>" method="post">
<tbody>
<tr>
<td data-th="Product">
<div class="row">
<div class="col-sm-2 hidden-xs"> <img style="height:100px;"src="<?php echo $post->Directory?>"></div>
<div class="col-sm-10">
<h4 class="nomargin"></h4>
</div>
</div>
</td>
<td data-th="Price"><?php echo $post->Price;?></td>
<td data-th="Price" style="text-align:left"><input type="number" value="<?php echo $post->Quantity; ?>" class="form-control" style="width:60px"/></td>
<td data-th="Price" style="text-align:center"><?php echo $subtotal = $post->Price * $post->Quantity; ?></td>
<td class="actions" data-th="">
UPDATE
<button class="btn btn-danger btn-sm">DELETE<i class="fa fa-trash-o"></i></button>
</td>
</tr>
<?php $total += $subtotal; ?>
</tbody>
<tfoot>
<tr class="visible-xs">
<td class="text-center"><strong>
</strong></td>
</tr>
<tr>
<td></td>
<td colspan="2" class="hidden-xs"></td>
<td></td>
<td></td>
</tr>
</tfoot>
</form>
<?php } ?>
</table>
<center><form action="<?php echo base_url(); ?>index.php/Transaction_Controller/Products_Ordered/" method="post">
<input type="hidden" value="<?=$total?>" name="total"/>
<input type="hidden" value="<?php echo $post->Account_ID; ?>" name="id"/>
<button type="submit" class="btn btn-success btn-block">PAY NOW! <i class="fa fa-angle-right"></i></button>
</form><br/><br/>
</div>
</div>
</div>
</div>
why is this happening?

Answer 1

I've got the same error after upgrade from PHP 5.6 to PHP 7.1 on one project using CodeIgniter 2.
I fix it like this:
// line 224 of file /system/database/DB_active_rec.php
$explode = explode('.', $item);
return end($explode);
instead of
return end(explode('.', $item));

Answer 2

This notice is triggered by E_STRICT error reporting, because of this code in CodeIgniter 2:
// DB_active_rec.php line 225
end(explode('.', $item));
CodeIgniter 2 is not developed anymore and you should update to CodeIgniter 3.