treeview.php

function buildTree($array, $currentParent, $currLevel = 0, $prevLevel = -1) {
  foreach ($array as $categoryId => $category) {
  if ($currentParent == $category['parent_id']) {
  if ($currLevel > $prevLevel) echo "<ol id='menutree'>"; 
  if ($currLevel == $prevLevel) echo "</li>";
  echo '<li> <label class="menu_label" for='.$categoryId.'>'.$category['name'].'</label><input type="checkbox" id='.$categoryId.' />';
  if ($currLevel > $prevLevel) { $prevLevel = $currLevel; }
  $currLevel++; 
  buildTree ($array, $categoryId, $currLevel, $prevLevel);
  $currLevel--;   
  }
  }
  if ($currLevel == $prevLevel) echo "</li> </ol>";
}