Codeigniter中foreach循环中的未定义变量

Question

我是codeigniter的初学者，我正在制作一个用于学习的基本积垢。我在索引中遇到了一个错误。php

<h2><?=$title?></h2>

<?php foreach($posts as $post)?>
<h3><?php echo $post['title'];?></h3>o
<small class="post-date">Posted on:<?php echo $post['created at'];?>         </small><br>
<?php echo word_limiter($post['body'],60);?>
<p><a class="btn btn-default" href="<?php echo site_url('/posts/' .$post['slug']);?>">read more</a></p>
<?php endforeach;?>

遇到PHP错误严重性：注意：消息：未定义变量：posts
文件名：posts/index。php
行号：2
回溯：
文件：/opt/lampp/htdocs/codeigniter/application/views/posts/index。php
行：2
函数：\u错误\u处理程序

文件：/opt/lampp/htdocs/codeigniter/application/controllers/Posts。php
行：23
函数：视图

文件： /opt/lampp/htdocs/codeigniter/index.php
行：315
函数：require_once

我的控制器是

<?php
class Posts extends CI_Controller {

public function index(){
    $data['title']='Latest Posts';
    $data['posts']=$this->Post_model->get_posts();

    $this->load->view('templates/header');
    $this->load->view('posts/index',$data);
    $this->load->view('templates/footer');
}

public function view($slug=NULL)
{
    $data['post'] = $this->Post_model->get_posts($slug);

    if(empty($data['post'])){
        show_404();
    }

    $data['title']=$data['post']['title'];
    $this->load->view('templates/header');
    $this->load->view('posts/view', $data);
    $this->load->view('templates/footer');
}

public function create(){
    $data['title'] = 'create post';

    $this->form_validation->set_rules('title','Title','required');
    $this->form_validation->set_rules('body','body','required');

    if($this->form_validation->run() === false) {

        $this->load->view('templates/header');
        $this->load->view('posts/create',$data);
        $this->load->view('templates/footer');

    } else {

    $this->Post_model->create_post();

    redirect('posts');

    }

}

public function delete($id) {
    $this->Post_model->delete_post($id);
    redirect('posts');
}

public function edit($id)  {

    $data['post'] = $this->Post_model->get_posts($slug);

    if(empty($data['post'])){
        show_404();
    }

    $data['title'] = 'edit post';

    $this->load->view('templates/header');
    $this->load->view('posts/index',$data);
    $this->load->view('templates/footer');
}

public function update()
{
    $this->Post_model->update_post();
    redirect('posts');
}

}

我的模型文件是

<?php

class Post_model extends CI_Model{

    public function __construct(){
        $this->load->database();
    }

    public function get_posts($slug = false){

        if($slug === false) {
            $this->db->order_by('id','DESC');

            $query=$this->db->get('posts');
            return $query->result_array();

        }

        $query = $this->db->get_where('posts',array('slug' => $slug));

        return $query->row_array();
    }

    public function create_post(){
        $slug=url_title($this->input->post('title'));

        $data=array(
            'title' => $this->input->post('title'),
            'slug' => $slug,
            'body' => $this->input->post('body')
        );

        return $this->db->insert('posts',$data);
    }

    public function delete_post($id){
        $this->db->where('id',$id);
        $this->db->delete('posts');
        return true;
    }

    public function update_post() {

        $slug=url_title($this->input->post('title'));

        $data=array(
            'title' => $this->input->post('title'),
            'slug' => $slug,
            'body' => $this->input->post('body')
        );  

        $this->db->where('id',$this->input->post('id'));
        return $this->db->update('posts',$data);

    }

}

Answer 1

在控制器上的编辑功能中，您有edit（$id）

但是，在加载模型的地方，您有get\u posts（$slug）它应该是get\u posts（$id）

并将$data['post']更改为$data['post']

public function edit($id)  {

    $data['posts'] = array();

    // rename slug to id
    $data['posts'] = $this->post_model->get_posts($id);

    if(empty($data['posts'])){
        show_404();
    }

    $data['title'] = 'edit post';

    $this->load->view('templates/header');

    /*
      Tip You don't have to use index.php on for view you could create a
      another view instead $this->load->view('posts/edit_view',$data);
    */

    $this->load->view('posts/index',$data); 
    $this->load->view('templates/footer');
}

关于控制器的when-load模型

改变

$this->Post_model->get_posts($id);

到

$this->post_model->get_posts($id);

https://www.codeigniter.com/user_guide/general/models.html#loading-a型

在utoload.php

改变

$autoload['model'] = array('Post_model');

到

$autoload['model'] = array('post_model');

并在自动加载中加载数据库。php让生活更轻松

$autoload['libraries'] = array('database');