PHP와 opendir()을 사용하여 디렉토리 목록을 알파벳순으로 정렬하려면 어떻게 해야 합니까?

<code class="php"><?php
// Read files into array
$dirFiles = array();
if ($handle = opendir('Images')) {
    while (false !== ($file = readdir($handle))) {
        // Hide folders and files
        if ($file != "." && $file != ".." && $file != "index.php" && $file != "Thumbnails") {
            $dirFiles[] = $file;
        }
    }
    closedir($handle);
}

// Sort files alphabetically
sort($dirFiles);

// Display sorted list
foreach($dirFiles as $file) {
    // Replace code to modify filename
    echo "<li><a href=\"Images/$file\" class=\"thickbox\" rel=\"gallery\" title=\"$file\"><img src=\"Images/Thumbnails/$file\" alt=\"$file\" width=\"300\"  </a></li>\n";
}
?></code>