Question

感谢上一个问题的帮助我在Topic类中的项目有问题，可以查看特殊类别中的所有主题在主题＆＃39;中查看我的功能。类：

/*
 * 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;

}

这是我在根文件夹中的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;

?>

当我点击类别链接（＆＃39; topics.php？category = 1＆＃39;）时出现此错误：

注意：未定义的变量：他的   第74行的C：\ xampp \ htdocs \ talkingspace \ libraries \ Topic.php

注意：尝试获取非对象的属性   第74行的C：\ xampp \ htdocs \ talkingspace \ libraries \ Topic.php

致命错误：在null中调用成员函数bind（）   第74行的C：\ xampp \ htdocs \ talkingspace \ libraries \ Topic.php

我想也许我在DB的SELECT for SELECT中失败了。

任何帮助的最佳问候。

Answer 1

纠正这一行

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

$this而不是$his

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

Answer 2

在主题类的$his函数中将$this修改为getByCategory()。

按类别ID获取

2 个答案: