得到

Question

感謝幫助我的最後一個問題 我有我的主題類項目視圖在一個特殊的 類別看看我的功能在「主題」類中的所有主題的問題：

/* 
* Get topics by Category 
*/ 
public function getByCategory($category_id){ 
    $this->db->query("SELECT topics.*, categories.*, users.username, users.avatar FROM topics 
         INNER JOIN categories 
         ON topics.category_id = categories.id 
         INNER JOIN users 
         ON topics.user_id = users.id 
         WHERE topics.category_id = :category_id 
    "); 
    $his->db->bind(':category_id', $category_id); 

    //Assign Result Set 
    $results = $this->db->resultset(); 

    return $results; 

} 

這是我的根文件夾topics.php

<?php require('core/init.php');?> 
<?php 
//create New Topic 
$topic = new Topic; 

//Get Category From URL 
$category = isset($_GET['category']) ? $_GET['category'] : null; 

//Get user From URL 
$user_id = isset($_GET['user']) ? $_GET['user'] : null; 

//Get Template & Assign Vars 
$template = new Template('templates/topics.php'); 

//Assign Template Variables 
if(isset($category)){ 
    $template->topics = $topic->getByCategory($category); 
    $template->title = 'Posts In "'.$topic->getByCategory($category)->name.'"'; 
} 

//Assign Template Variables 
if(isset($user_id)){ 
    $template->topics = $topic->getByUser($user_id); 
    $template->title = 'Posts By "'.$topic->getUser($user_id)->username.'"'; 
} 


if(!isset($category) && !isset($user_id)){ 
    $template->topics = $topic->getAllTopics(); 
} 

//Assign vars 

$template->totalTopics = $topic->getTotalTopics(); 
$template->totalCategories = $topic->getTotalCategories(); 

// display Template 
echo $template; 

?> 

當我點擊一個類別的鏈接（'topics.php類= 1？）有此錯誤：

Notice: Undefined variable: his in C:\xampp\htdocs\talkingspace\libraries\Topic.php on line 74

Notice: Trying to get property of non-object in C:\xampp\htdocs\talkingspace\libraries\Topic.php on line 74

Fatal error: Call to a member function bind() on null in C:\xampp\htdocs\talkingspace\libraries\Topic.php on line 74

我想也許我失敗了從數據庫的SELECT查詢。

任何幫助的最佳問候。

Answer 1

更正此行

$his->db->bind(':category_id', $category_id); 

這將是$this不$his

$this->db->bind(':category_id', $category_id); 

Answer 2

修改$his到$this在主題類的getByCategory()功能。