Recursive PHP function that eats through links and creates a box with them.

recursive-link-box.php

<?php
function box_linklist($links = NULL) {
  if (is_null($links)) {
    // Just a set of defaults for development. 
    $links = array(
      array(
        "text" => "Sample",
        "children" => array(
          array(
            "text" => "1. Subitem",
            "children" => array(
              array(
                "text" => "2. Subitem",
                "attributes" => array(
                  "target" => "_blank",
                  "href" => "#"
                )
              )
            ),

            "attributes" => array(
              "target" => "_blank",
              "href" => "#"
            )
          )
        ),
        "attributes" => array(
          "target" => "_blank",
          "href" => "#"
        )
      )
    );
  }

  function recursiveChildren($links) {
    foreach ($links as $link): ?>
    <li class="<?php echo !empty($link["children"]) ? 'parent' : 'child' ?>">
      <i class="fa fa-li <?php echo !empty($link["children"]) ? 'fa-plus' : 'fa-chevron-right'; ?>"></i>
      <a <?php foreach ($link['attributes'] as $key => $value) { echo "$key='$value'" ; } ?>>
       <?php echo $link['text']; ?>
      </a>
      <?php
      if (!empty($link['children'])) {
        echo "<ul class='submenu'>";
        recursiveChildren($link['children']);
        echo "</ul>";
      }
      ?>
    </li>
    <?php endforeach;
  }

  ?>
  <div class="box box-linklist collapsible">
    <div class="box-content bg--white">
      <ul class="fa-ul">
      <?php recursiveChildren($links); ?>
      </ul>
    </div>
  </div>
  <?php
}