How to pass a value to a php variable?

I’m currently working on a library system and I encountered a problem of mine which I’ve encoutered for the first time. When I displayed all the books that are currently in the library, I loop them to tables using php. Now, I want to pass the ISBN value of a current column to a variable and maybe use it to run a query to display information of a certain book. Below is the div part of my code.

    <div class="search-result">
        <table cellspacing="0">
            <tr>
                <th>ISBN</th>
                <th>BOOK TITLE</th>
                <th class="authorName">AUTHOR NAME</th>
                <th>SERIES</th>
                <th></th>
            </tr>

            <tr>
                <?php
                    while($row = mysqli_fetch_assoc($query)){
                ?>
                    <td><?php echo $row['ISBN'] ?></td>
                    <td><?php echo $row['Title'] ?></td>
                    <td><?php echo $row['Author'] ?></td>  
                    <td><?php echo $row['Series'] ?></td>
                    <td><a class="borrow-button" href="view.php">BORROW</a></td>
            </tr>
            <?php } ?>
        </table>
    </div>

I’ve not tried anyting solution because I can’t find on the internet what I’ve been looking for. I hope someone can help me