Getting a modified preorder tree traversal model (nested set) into a

Question

I am trying to get my data which is hierarchically set up with a tree traversal model into an < ul> in order to show on my site.

Here is my code:

Answer 1

Simply loop thru the result will do:

$sql = "SELECT node.name, (COUNT(parent.name) - 1) AS depth
        FROM nested_category AS node,
        nested_category AS parent
        WHERE node.lft BETWEEN parent.lft AND parent.rgt
        GROUP BY node.name
        ORDER BY node.lft";

$query_result = mysql_query($sql)

$result = "
";
$currDepth = 0;

while($row = mysql_fetch_assoc($query_result))
{
  if($row['depth'] > $currDepth)
  {
    $result .= "
"; // open sub tree if level up
  }

  if($row['depth'] < $currDepth)
  {
    $result .= str_repeat("
", $currDepth - $row['depth']); // close sub tree if level down
  }

  $result .= "
$row['name']
"; // Always add node
  $currDepth = $row['depth'];
}
$result .= "
";

echo $result;