Question

我尝试创建一个侧面类别菜单栏，因此当用户点击某个类别时，它必须显示该类别的所有产品，但它不能正常工作。类别页面确实已加载，但未加载属于某个类别的任何产品。我认为加载类别页面时链接也是正确的？：Product/category/3

这是我在加载category.php视图文件时遇到的错误：

 A PHP Error was encountered

Severity: Error

Message: Cannot use object of type stdClass as array

Filename: views/category.php

Line Number: 42

Line number 42 in category.php: <a href="<?php echo base_url() ?>/Product/details/<?php echo $product['product_id']; ?>">

这是我的完整category.php视图文件：

 <?php   include_once ('templates/header.php');  ?>

<!-- Alle cadeaus gele title bovenaan pagina -->

<div class="container-fluid">
    <div class="row">
        <div class="col-lg-12 bg-warning" style="font-size:25px">
            <center>Alle cadeaus</center>
        </div>
        </div>
</div>

 <hr />

<br>

<!-- Cadeau categorie side menu -->
<div class="container-fluid">
    <div class="row">
            <div class="col-md-4">
                <div id="categorymenu">
                    <center>  <h3>Categorieën</h3> </center>
                    <ul class="list-group">
                         <?php foreach (get_categories_h() as $category) : ?>
             <li class="list-group-item">
                 <a href="<?php echo base_url().'Product/category/' . $category->id; ?>"> <?php echo $category->name; ?></a>
            </li>
         <?php endforeach; ?>
                    </ul>
                </div>
            </div>




<!-- Laat cadeau zien op alle cadeaus pagina -->
<!-- Laat cadeau zien op alle cadeaus pagina -->
<div class="col-md-8">
<?php foreach($products as $product) { ?>
    <div class="col-md-2">
        <div id="product">
          <a href="<?php echo base_url() ?>/Product/details/<?php echo $product['product_id']; ?>">
          <img src="<?php echo base_url(); ?>upload/<?php echo $product['product_foto_thumb']; ?>">
        </a>
        <div class="product_naam"><?php echo $product['product_naam']; ?></div>
        <div class="ophaal_plaats">
           <?php  echo $product['ophaal_plaats'];; ?>
        </div>
        <div class="aangeboden_door">
            <p>Aangeboden door: Peter</p>
              </div>
        </div>
        </div>
<?php } ?>
</div>




</div>





<div class="clearfix"></div>

 <?php   include_once ('templates/footer.php');  ?>

db_helper.php文件：

<?php if (!function_exists('get_categories_h')) {
    function get_categories_h(){
        $CI = get_instance();
        $categories = $CI->Product_model->get_categories();
        return $categories;
    } } ?>

Product.php控制器文件：

<?php
 defined('BASEPATH') OR exit('No direct script access allowed');
class Product extends CI_Controller { 

  public function __construct()
  {
    parent::__construct();
    $this->load->model('Product_model');
    $this->load->helper(array('form', 'url'));
  }

  var $data = array();

  public function index()
  {
  //Laad kado uploaden view
  $this->load->view('product_form', $this->data);
  }

  public function details($product_id)
  {
    //load the Product_model
    $this->load->model('Product_model');
    //call function getdata in de Product_model
    $data['userdetail_list'] = $this->Product_model->getdata();

    //get product details
     $data['products'] = $this->Product_model->get_product_details($product_id);

    //laad view
    $data['main_content'] = 'details';
    $this->load->view('details',$data); 
  }
  //categorie product functie
  public function category($id)
  {
    $data['title'] = 'Category';
    $data['page'] = 'Product/category';
    $data['category'] = $this->Category_model->findByCategory($id);
    $data['products'] = $this->Product_model->findByCategory($id);
    $this->Category_model->findByCategory($id);
    $this->load->view('category', $data);
  }

Category_model文件：

<?php
class Category_model extends CI_Model {
    public function findByCategory($id)
          {
              $this->db->select('*'); 
              $this->db->where('id', $id);
              $q = $this->db->get('categories');
              if($q->num_rows() > 0) { 
                  foreach ($q->result() as $row) { 
                      $data[] = $row; 
                  }
                  return $data; 
              } 
          }
}
?>

Product_model：

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Product_model extends CI_model {

    public function saveProduct($data) { 
        $this->db->insert('products', $data);
        $product_id = $this->db->insert_id();
        return $product_id;
    }
      public function getdata()
    {
        $this->db->select('users.user_id,users.email,users.voornaam,products.product_id,products.category_id,products.product_naam');
        $this->db->from('users');
        $this->db->join('products','products.user_id = users.user_id');
        $query = $this->db->get();
        if($query->num_rows()>0)
        {
           return $query->result_array();
        }
    }

    public function get_product_details($product_id) {
        $arrReturn = array();
        $this->db->select('*');
        $this->db->from('products');
        $this->db->where('product_id', $product_id);
        $query = $this->db->get();
        $result = $query->result_array();
        if (!empty($result)) {
            $arrReturn = $result[0];
        }
        return $arrReturn;
    }


    /*
      Get categories
     */
    public function get_categories(){
        $this->db->select('*'); 
        $this->db->from('categories'); 
        $query = $this->db->get(); 
        $result = $query->result();
        return $result;
    }
    public function findAll(){
        return $this->db->get('products')->result();
    }


    public function findByCategory($id){
              $this->db->select('*'); 
              $this->db->where('id', $id);
              $q = $this->db->get('categories');
              if($q->num_rows() > 0) { 
                  foreach ($q->result() as $row) { 
                      $data[] = $row; 
                  }
                  return $data; 
              } 
          }
}
?>

数据库表：

1.products -product_id

2.categories -id -name

当我这样打印时：

:

Answer 1

$ products是一个变量，您将其用作函数。试试这段代码：

<?php foreach($products as $product) { ?>

Answer 2

您似乎将$ product作为数组传递通过

//get product details
    $data['product'] = $this->Product_model->get_product_details($product_id);

因此您需要在控制器中将其更改为$ data ['products'] =

//get product details
    $data['products'] = $this->Product_model->get_product_details($product_id);

在您的视图中建议 usman ikram 执行更改。这将解决该特定错误。

<强>更新

由于Op提供了$ products的输出......

输出是一个关联数组 - 所以你要引用product_id，比如......

$product['product_id'];

同样对所有其他人......

更新2： 用于调试的示例测试代码

尝试这样的事情来帮助了解正在发生的事情。

function test_product_array() {
    // create a test array
    $test_array = array(
        ['product_id' => 1, 'category_id' => 1],
        ['product_id' => 2, 'category_id' => 2],
        ['product_id' => 3, 'category_id' => 3]
    );

    echo ' Display the Array using print_r <br>';
    echo "<pre>";
    print_r($test_array); // Prove the array format is the same
    echo "</pre>";

    echo '<br><br>';
    // Display the results
    foreach ($test_array as $product) {
        echo ' Product ID: ' . $product['product_id'];
        echo ' Category ID: ' . $product['category_id'];
        echo '<br><br>';
    }
}

所以按照你的数组输出，这是它的简化版本。

无法在类别页面上加载categoryproducts

2 个答案: