PHP - Problem With Foreign Key,

t_Users
+----------+----------+------------+
|UserID    | AgencyID |User name   |
+----------+----------+------------+
|1         | 1        |john        |
+----------+----------+------------+
|2         | 1        |andrew      |
+----------+----------+------------+


t_Agencies
+----------+------------+
|AgencyID  |agency name |
+----------+------------+
|1         |police      |
+----------+------------+
|2         |immigration |
+----------+------------+

CREATE TABLE posts (
postId INT(11) NOT NULL UNIQUE AUTO_INCREMENT,	
title VARCHAR(255) NOT NULL,
author VARCHAR(24) NOT NULL,	
description TEXT NOT NULL,       
createdAt TIMESTAMP,
PRIMARY KEY (postId)    
);
CREATE TABLE comments(
commentId INT(11) NOT NULL UNIQUE AUTO_INCREMENT,    
comment  TEXT NOT NULL,
postId INT(11),
userId INT(11),
createdAt TIMESTAMP,	
PRIMARY KEY (commentId),
FOREIGN KEY (userId) REFERENCES users(userId),
FOREIGN KEY (postId) REFERENCES posts(postId)   
);
CREATE TABLE replies (
repId INT(11) NOT NULL UNIQUE AUTO_INCREMENT,   
reply  TEXT NOT NULL,
userId INT(11),
commentId INT(11), 	
createdAt TIMESTAMP,     
PRIMARY KEY (repId),
FOREIGN KEY (userId) REFERENCES users(userId),
FOREIGN KEY (commentId) REFERENCES comments(commentId)     
);
CREATE TABLE users (
userId INT(11) NOT NULL UNIQUE AUTO_INCREMENT,
userName VARCHAR(100) NOT NULL,,	          
email VARCHAR(100) NOT NULL,
PRIMARY KEY (userId)
);

how to retrive userName,comment, and createdAt from users and comments table while I have used userId as a  Foreign key on the comment table

if it isn't correct, correct me please

Guys thanks for helping me solve the problem i had but now i have another problem and i am lost. i have included the code below for you to have overview.

On the home page the url shows how it should be: http://localhost/board/italian.php?country=Italian
BUT 
When you mouse over the NEXT link to go to next page you get this : http://localhost/board/?page=1&country=Italian  and then an error 404 when you click on the link
page = 1  no matter if you are mousing over link for page 5 or 2

This is the code:

<table style="width:100%; margin-left:auto; margin-right:auto">
        <?php    
            
            $items_per_page = 5;//how many records/rows to display per page
                        
            $page_url      = "http://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
                                    
            $cleaned_current_page_country = htmlspecialchars($_GET["country"]);
                        
            $page_number = (isset($_GET['page']))? filter_var($_GET['page']) : 1;
            //$page_number = filter_var($_GET['page']);
            //$page_number = $_GET['page'];
                
            $selected_restaurant_type = $_GET['country'];
                                                            
            // find number of rows in the db
                $query = "SELECT * FROM menu_update WHERE special_of_theday = 1 AND restaurant_type = '".$selected_restaurant_type."' ";
                $query_result = mysqli_query($connection, $query); 
                $row_count = mysqli_fetch_array($query_result);
                $total_rows = mysqli_num_rows($query_result);
                                                
            $expected_number_of_pages = ceil($total_rows/$items_per_page); //expected number of pages 
                                                
            $page_position = (($page_number - 1) * $items_per_page); //get starting position to fetch record
                        
            //fetch a group of records using sql LIMIT clause
                $query = "SELECT * FROM menu_update WHERE special_of_theDay = 1 AND restaurant_type = '".$selected_restaurant_type."' LIMIT " .$page_position. ',' .$items_per_page;
                $query_result = mysqli_query($connection, $query);
        ?>
                        
            <table width="100%" border=0>
                <tr bgcolor = "#cccccc">
                    <td>Meal</td>
                    <td>Meal name</td>
                    <td>Meal Price</td>
                    <td>Order Now</td>
                    <td>Full Menu</td>
                    <td>Our Gallery</td>
                    <td>Find Us</td>
                    <td>Our Chef</td>
                    <td>Our Manager</td>
                </tr>
        <?php
                while($row_count = mysqli_fetch_array($query_result)){
                    echo "<tr>";
                        echo"
                            <td style ='width:200px; text-align:center; height:120px; background:#eaedf2'><a href='meal_fullPic.php'><img src= ".$row_count['img']." /></a></td>
                            <td style ='width:119px; text-align:center; height:120px; background:#eaedf2'> ".$row_count['meal_name']."</td>
                            <td style ='width:100px; text-align:center; height:120px; background:#eaedf2'>".$row_count['price']."</td>
                            <td style ='width:100px; text-align:center; height:120px; background:#eaedf2'><a href='order_processor.php'><img src= ".$row_count['order_now']." /></a></td>
                            <td style ='width:100px; text-align:center; height:120px; background:#eaedf2'><a href='full_menu.php'><img src= ".$row_count['full_menu_img']." /></a></td>
                                    
                            <td style ='width:170px; text-align:center; height:120px; background:#eaedf2'><a href='restaurant_gallery.php'><img src= ".$row_count['restaurant_pic']." /></a></td>
                            <td style ='width:100px; text-align:center; height:120px; background:#eaedf2'><a href='restaurant_location.php'><img src= ".$row_count['location_pic']." /></a></td>
                            <td style ='width:119px; height:120px; background:#eaedf2'> ".$row_count['chef_name']."</td>
                            <td style ='width:119px; height:120px; background:#eaedf2'> ".$row_count['admin']."</td>
                        "; 
                    echo "</tr>";
                }
                mysqli_close($connection);
        ?>    
            </table>
        <div class="board_pagination">
        <?php
            //display the links to the pages
            for($current_page = 1; $current_page <= $expected_number_of_pages; $current_page++){
                 if ($page_number != $expected_number_of_pages){
                    $data = array(
                        'page' => $page_number,
                        'country' => $cleaned_current_page_country,
                    );
                    $the_query = http_build_query($data);
                    $page_url .= '?' . $the_query;
                    echo '<li><a href=" '.$the_query.' ">'.$current_page.'</a></li> ';
                }
            }
        ?>
        </div>
    </table>