Is it necessary to use JavaScript in addition to PHP to achieve the desired directory structure display on a website?

To achieve a dynamic directory structure display on a website, it is not necessary to use JavaScript in addition to PHP. You can use PHP to scan the directory and generate the HTML needed to display the structure. By using PHP's filesystem functions, you can easily retrieve the directory contents and create a recursive function to display them in a structured way on your website.

<?php
function displayDirectory($dir){
    $files = scandir($dir);
    
    echo "<ul>";
    foreach($files as $file){
        if($file != '.' && $file != '..'){
            echo "<li>$file</li>";
            if(is_dir($dir . '/' . $file)){
                displayDirectory($dir . '/' . $file);
            }
        }
    }
    echo "</ul>";
}

$rootDir = 'path/to/your/directory';
displayDirectory($rootDir);
?>