如果我想查询数据库中的所有表，我该怎么办？

Question

现在我只能从数据库中只抓取一个特定的表。我有一些理论，我试过SELECT * FROM *，但这根本不起作用。我很乐意给予任何帮助！这是我的代码：

<?php

    if (isset($_POST['submit-search'])){
        $conn = mysqli_connect("localhost","root","***","photos");
        $search = mysqli_real_escape_string($conn, $_POST['search']);
        $sql = 'SELECT * FROM images WHERE image LIKE "%'.$search.'%"';
        $result = mysqli_query($conn, $sql);
        $queryResult = mysqli_num_rows($result);

        echo "<p>Found ".$queryResult." quote(s)</p>";

        if ($queryResult > 0){
            while($row = mysqli_fetch_assoc($result)){
                echo "<a href='uploads/".$row['image']."' data-fancybox='quote'>";
                echo "<img id='img_div' src='uploads/".$row['image']."'/>";
                echo "</a>";
            }

        } else{
            echo "There are no quotes matching your search.";
        }
    }


?>