无法使用内部联接和自定义获取 post 函数从所有三个 table 获取所有 post

Question

我无法从这三个 table“帖子、类别、用户”中获取所有帖子。当我尝试加载页面 index.php:

时出现以下错误

Here are the page structure and code : index.php

<?php 
include_once('resourses/init.php'); 
$posts = getPosts();
?>
<html>
  <head>
    <title>First Page</title>
  </head>
<body>
 <?php 
    foreach($posts as $post){
 ?>
   <a href=""><?php echo $post['title'];?></a>
 <?php                   
    }
 ?>
</body>
</html>

Second php file is : init.php

 <?php
   //error_reporting(0);
   include_once('config.php');    
   include_once('func.php');    
 ?>

Third file of init.php -> config.php

<?php
$config['db_host'] = 'localhost';
$config['db_user'] = 'root';
$config['db_pass'] = 'usbw';
$config['db_name'] = 'cblog';
foreach($config as $key => $value){
    define(strtoupper($key), $value);
}
$db = mysqli_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME);
if(!$db){
    echo "Unable to connect due to: ".mysqli_connect_error($db);
}
?>

And last file of init.php -> func.php

<?php
function getPosts(){
$query ="
SELECT posts.id, posts.cat_id, posts.user_id, posts.title, posts.contents,                             posts.date_posted, categories.name, users.name FROM posts 
INNER JOIN categories ON posts.id=categories.id 
INNER JOIN users ON posts.user_id=users.id 
ORDER BY posts.id DESC";
$runQuery = mysqli_query($db, $query);
while($row = mysqli_fetch_assoc($runQuery)){
    $posts[] = $row;
}
}
?>

When i browse the index.php page it show some errors, plz see screenshot mentioned below:

Answer 1

如错误所述，init.php 中的 $db 参数在 func.php 脚本中无法识别。有没有理由把它们分开，如果不把它们放在一个文件中，那是有道理的。

然后在 func.php 中数组 $posts[] 没有被初始化。执行 $posts = array(); 然后 array_push($row);

这应该可以修复错误。

无法使用内部联接和自定义获取 post 函数从所有三个 table 获取所有 post

Unable to get all posts from all three table using inner join and custom get post function

html

php

mysqli

runtime-error

inner-join