Php 不同网页中的动态评论系统

我制作了一个动态网页，我想为不同的网页制作一个动态评论系统，我的编码如下：

home.php

<?php

$con = new mysqli("localhost","root","","writersplanet");
$sql = "SELECT * FROM books ORDER BY RAND()";
$execute = mysqli_query($con,$sql);

while ($row = mysqli_fetch_assoc($execute)) {



    $query_string = http_build_query($row);

    echo "<div class='container' align='center'>
        <a href='readbook.php?$query_string'>
        <div class='box'>
                <div class='imgbox'>
                    <img src='upload/".$row['uploadcoverimg']."'>
                </div>
                <div class='content'>
                    <h3>".$row['bookname']." <i class='fas fa-chevron-circle-right'></i>".$row['uname']."</h3>
                    <p>".$row['summary']."</p>
                </div>
        </div>
        </a>
        <div class='outcome'>
            <div class='heart'>
                <i class='fas fa-heart'></i>
            </div>
            <div class='eye'>
                <i class='fas fa-eye'></i>
            </div>
             <div class='ratings'>
                <i class='fas fa-star-half-alt'></i>
            </div>
        </div>
        <div class='scrollmenu1'>
            <a href='#home' >Horror</a>
            <a href='#news' >Sci-Fi</a>
            <a href='#contact' >Love</a>
        </div>
        <div class='content1'>
                <h2>Time</h2>
                <p><br>
                    Writers Thoughts about this book:
                    ".$row['thoughts']."
                </p>
        </div>
    </div>";
}
?>

<?php
session_start();
date_default_timezone_set('Asia/Kolkata');
$con = new mysqli("localhost","root","","writersplanet");
function setcomments($con)
{
    if (isset($_POST['submit'])) {

        $uname = $_SESSION['username'];
        $bookname = $_SESSION['bookname'];
        $date = $_POST['date'];
        $message = $_POST['message'];
        $result = mysqli_query($con,"INSERT INTO comments(uname,bookname, subject, time) VALUES ('$uname','$bookname','$message','$date')");
    }
}
function getcomments($con)
{
    $sql = "SELECT * FROM comments";
    $result = mysqli_query($con,$sql);
    $bookname = $_SESSION['bookname'];
    while ($row = mysqli_fetch_assoc($result)) {
        if ($bookname =$row['bookname']) {
            echo "<div class='usercomment'>";
            echo "<p class='uname'>";
            echo $row['uname'];
            echo "</p><p class='time'>";
            echo $row['time'];
            echo "</p>";
            echo "<div class='commentbox'><p class='subject'>";
            echo $row['subject'];
            echo "</p></div>";
            echo "</div>";
            }
        }
}

在主页中，当你点击一个链接时，它会将你带到一个新的网页，在那里你可以发表评论。现在，单击链接后，链接页面将带您进入readbook.php，这里是它的编码：

readbook.php

<?php

$con = new mysqli("localhost","root","","writersplanet");
$sql = "SELECT * FROM books ORDER BY RAND()";
$execute = mysqli_query($con,$sql);

while ($row = mysqli_fetch_assoc($execute)) {



    $query_string = http_build_query($row);

    echo "<div class='container' align='center'>
        <a href='readbook.php?$query_string'>
        <div class='box'>
                <div class='imgbox'>
                    <img src='upload/".$row['uploadcoverimg']."'>
                </div>
                <div class='content'>
                    <h3>".$row['bookname']." <i class='fas fa-chevron-circle-right'></i>".$row['uname']."</h3>
                    <p>".$row['summary']."</p>
                </div>
        </div>
        </a>
        <div class='outcome'>
            <div class='heart'>
                <i class='fas fa-heart'></i>
            </div>
            <div class='eye'>
                <i class='fas fa-eye'></i>
            </div>
             <div class='ratings'>
                <i class='fas fa-star-half-alt'></i>
            </div>
        </div>
        <div class='scrollmenu1'>
            <a href='#home' >Horror</a>
            <a href='#news' >Sci-Fi</a>
            <a href='#contact' >Love</a>
        </div>
        <div class='content1'>
                <h2>Time</h2>
                <p><br>
                    Writers Thoughts about this book:
                    ".$row['thoughts']."
                </p>
        </div>
    </div>";
}
?>

<?php
session_start();
date_default_timezone_set('Asia/Kolkata');
$con = new mysqli("localhost","root","","writersplanet");
function setcomments($con)
{
    if (isset($_POST['submit'])) {

        $uname = $_SESSION['username'];
        $bookname = $_SESSION['bookname'];
        $date = $_POST['date'];
        $message = $_POST['message'];
        $result = mysqli_query($con,"INSERT INTO comments(uname,bookname, subject, time) VALUES ('$uname','$bookname','$message','$date')");
    }
}
function getcomments($con)
{
    $sql = "SELECT * FROM comments";
    $result = mysqli_query($con,$sql);
    $bookname = $_SESSION['bookname'];
    while ($row = mysqli_fetch_assoc($result)) {
        if ($bookname =$row['bookname']) {
            echo "<div class='usercomment'>";
            echo "<p class='uname'>";
            echo $row['uname'];
            echo "</p><p class='time'>";
            echo $row['time'];
            echo "</p>";
            echo "<div class='commentbox'><p class='subject'>";
            echo $row['subject'];
            echo "</p></div>";
            echo "</div>";
            }
        }
}

---

好的，那有什么问题吗？先生，如果用户在一个网页上写评论，那么它会在所有其他网页上显示评论。问题就在这里，你能在你的问题中提到你的问题吗？好的，先生，但是你知道这个答案吗？