unlink image using function in php - php

Question

Please help me how can i unlink a image when i delete a product.I dont know where is my error in my code .Thank everyone so much.I tried different way to resolve this problem.I teached myself learn to code on youtube, and then I tried to create another model.Please help me solve this problem.
Html Page
<h3>List Product</h3>
<table id="user">
<thead>
<tr>
<th>Serial</th>
<th>Product Name</th>
<th>Image</th>
<th>Price</th>
<th>Category</th>
<th>Type</th>
<th>Action</th>
</tr>
</thead>
<?php
if(!empty($_GET['msg'])){
$msg = unserialize(urldecode($_GET['msg']));
foreach ($msg as $key => $value){
echo '<span style="color:blue;font-weight:bold">'.$value.'</span>';
}
}
?>
<tbody>
<?php
$i = 0;
foreach($listproduct as $key => $listpro){
$i++;
?>
<tr>
<td><?php echo $i; ?></td>
<td><?php echo $listpro['productName']; ?></td>
<td><img src="<?php echo BASE_URL ?>/teamplate/image/<?php echo $listpro['image']; ?>" width="60" height="60"></td>
<td><?php echo $listpro['price']; ?></td>
<td><?php echo $listpro['catName'] ?></td>
<td>
<?php
if($listpro['type']==0){
echo 'Feathered';
}else{
echo 'Non-Feathered';
}
?>
</td>
<td>Delete
|| Edit
</td>
</tr>
<?php
}
?>
</tbody>
</table>
Function in Product page
public function delPro($id = NULL){
$tablePro = 'tbl_product';
$this->data = array();
$ProductModel = $this->load->model('ProductModel');
$result = $ProductModel->delProductById($tablePro, $id);
if($result == 1){
$this->data['productbyid'] = $ProductModel->updateProductById($tablePro, $id);
$path_unlink= BASE_URL."/teamplate/image/";
foreach($this->data['productbyid'] as $this->key => $this->value){
$image_pro = $this->value['image'];
unlink($path_unlink.$image_pro);
}
$mdata['msg'] = "Product Deleted Successfully...";
}else{
$mdata['msg'] = "Product Not Deleted...";
}
$url = BASE_URL."/Product/ListProduct?msg=".urlencode(serialize($mdata));
header("Location:$url");
}
ProductModel Page
public function updateProductById($tablePro, $id){
$query = "SELECT * from $tablePro where productId = '$id'";
return $this->db->select($query);
}