Warning: Invalid argument supplied for foreach() - php

Question

I have an error in the product detail, I do not know what else to change where again. when I change $detail into $categories succeed but is the same as function submenu. It was not according to my wishes
My View
<!-- navbar -->
<div class="row">
<?php foreach ($categories as $row) : ?>
<div class="col-sm-3">
<h5><?php echo $row->categoriesName; ?></h5>
<ul><li><a href="<?php echo base_url();?>member/detail">
<?php echo $row->productName; ?></a> </li></ul>
</div>
<?php endforeach; ?>
</div>
<!-- product detail -->
<?php foreach ($detail as $details_new) : ?>
<div class="box">
<h1 class="text-center"><?php echo $details_new->productName;?></h1>
<p class="price"><?php echo $details_new->price;?></p>
</div>
<?php endforeach; ?>
My Controller
public function home() {
$data=array('title'=>'Pasar Online | Ayo Belanja Sekarang',
'username'=> $this->session->userdata('username'),
'product' => $this->product_model->all(),
'categories' => $this->categories_model->get_main(),
'isi' =>'member/index');
$this->load->view('template_home/wrapper',$data);
}
public function detail() {
$data['username'] = $this->session->userdata('username');
$data['categories'] = $this->categories_model->get_main();
$data['detail'] = $this->categories_model->get_details();
$this->load->view('member/coba',$data);
}
My Model
public function get_main(){
$this->db->select('product.*,categories.*');
$this->db->from('product');
$this->db->join('categories','product.categoriesID=categories.categoriesID');
$this->db->limit(5);
$query = $this->db->get();
if($query->num_rows() > 0) {
$results = $query->result();
} return $results;
}
public function get_details() {
$query = $this->db->query("SELECT * FROM product WHERE productID");
$row = $query->row();
}
still can not display a single product
I do not know where my mistake... please help me, thanks

Answer 1

you are iterating details array in wrong format.
public function get_details() {
$query = $this->db->query("SELECT * FROM product WHERE productID");
$row = $query->row();
return $row;
}
This will return only single row without any indexing like - 0,1,2...
and on view page you are using foreach loop and foreach loop use indexing to iterate value you can iterate like that --
<div class="box">
<h1 class="text-center"><?php echo $detail->productName; ?></h1>
<p class="price"><?php echo $detail->price; ?></p>
</div>
please use this way hope it will work..

Answer 2

In codeigniter row() selects only first row of your result in object format.So no need to use foreach loop.Just try like this...
<div class="box">
<h1 class="text-center"><?php echo $detail->productName;?></h1>
<p class="price"><?php echo $detail->price;?></p>
</div>
And
In model
public function get_details() {
$query = $this->db->query("SELECT * FROM product WHERE productID");
$row = $query->row();
return $row;
}

Answer 3

it is because of $detail variable is empty, no data available in this variable, always check for data in variable before looping
<?php if(!empty($detail)){
foreach ($detail as $details_new) : ?>
<div class="box">
<h1 class="text-center"><?php echo $details_new->productName;?></h1>
<p class="price"><?php echo $details_new->price;?></p>
</div>
<?php endforeach; } ?>