php - Array to an unordered list

Question

I'm trying to map some arrays values to an unordered () list.

    <?php
            $files = scandir($dir);
            //remove "." and ".."
            print_r($files);
    ?>

    <ul>
        <?php foreach($files as $file): ?>
            <li><?= $file ?></li>
        <?php endforeach; ?>
    </ul>

It does iterate through the array correctly as it gives bullets for <li> elements. However no string output is seen next to those bullets. Also when I print_r the array the values are there.

The output looks like this with the correct number of bullets but no text next to them:

.
.
.

What am I doing wrong here? Thanks in advance.

Answer 1

function array2ul($array) {
    $out = "<ul>";
    foreach($array as $key => $elem){
        if(!is_array($elem)){
            $out .= "<li><span>" . $key . ": " . $elem . "</span></li>";
        } else {
            $out .= "<li><span>" . $key . "</span>" . array2ul($elem) . "</li>";
        }
    }
    $out .= "</ul>";
    return $out; 
}