PHP creating tree - php

Question

My mysql table looks like this:
I need to make 3 level tree, without House_NR.
-Country
|--City 1
| |--Street 1
| |--Street 2
|
|--City 2
|--City 3
| |--Sreet 1
| |--Steet 2
In PHP I make this sql query:
SELECT
l.Country_ID,
c1.Name AS Country_Name,
l.City_ID,
c2.Name AS City_Name,
l.Street_ID,
s.Name AS Street_Name,
l.House_NR
FROM Location l
JOIN Country c1 ON c1.id = l.Country_ID
JOIN City c2 ON c2.id = l.City_ID
JOIN Street s ON s.id = l.Street_ID
And I have this function:
function getTree($data) {
$tree = prepareTree($data);
drawTree($tree);
}
function prepareTree($data) {
$nodeList = array();
$tree = array();
foreach ($data as $key) {
$tree[$key["Country_ID"]]["name"] = $key["Country_Name"];
$tree[$key["Country_ID"]]["id"] = $key["Country_ID"];
$tree[$key["Country_ID"]]["level"] = 1;
$tree[$key["Country_ID"]]["children"][$key["City_ID"]]["name"] = $key["City_Name"];
$tree[$key["Country_ID"]]["children"][$key["City_ID"]]["id"] = $key["City_ID"];
$tree[$key["Country_ID"]]["children"][$key["City_ID"]]["level"] = 2;
$tree[$key["Country_ID"]]["children"][$key["City_ID"]]["children"][$key["Street_ID"]]["name"] = $key["Street_Name"];
$tree[$key["Country_ID"]]["children"][$key["City_ID"]]["children"][$key["Street_ID"]]["id"] = $key["Street_ID"];
$tree[$key["Country_ID"]]["children"][$key["City_ID"]]["children"][$key["Street_ID"]]["level"] = 3;
}
return $tree;
}
function drawTree($data, $sub = false) {
echo ($sub) ? "<ul class=\"tree-listCat\">" : "<ul class=\"tree-list\">";
foreach($data as $key) {
if ($key["children"] != null) {
echo "<li class=\"tree-itemCat\"><span class=\"tree-itemSel\">" . $key["name"] . "</span></li>";
drawTree($key["children"], true);
} else
echo "<li class=\"tree-item\"><span class=\"tree-itemSel\">" . $key["name"] . "</span></li>";
}
echo "</ul>";
}
This function works fine, but there some problem in function where function draw a html version of tree now I have this: action=search&type=tree&level=" . $key["level"] . "&id=" . $key["id"], but I need to have something like this:
If only country without child then action=search&type=tree&country=id
If only country and city without child street, then action=search&type=tree&country=id&city=id
If all arguments country, city and steet, then action=search&type=tree&country=id&city=id&street_id=id
And also function prepare tree looks bad (In my mind). In few words I need make a tree from Location database.