PHP showing menu tree in dropdown list - php

Question

Function to menu tree:
function category_tree($parent_id)
{
$sql = "SELECT * FROM menu WHERE parent_id ='".$parent_id."'";
$result = $conn->query($sql);
echo "<div id=\"wrapper\">
<div id=\"navmenu\">";
while($row = mysqli_fetch_object($result)):
$i = 0;
if ($i == 0) echo '<ul>';
echo '<li>' . $row->name;
category_tree($row->id);
echo '</li>';
$i++;
if ($i > 0) echo '</ul>';
endwhile;
echo "</div>
</div>";
}
The CSS file:
#navmenu {
margin: 0;
padding: 0;
}
#navmenu ul{
margin: 0;
padding: 0;
height:30px;
}
#navmenu li{
margin: 0;
padding: 0;
list-style: none;
float: left;
position: relative;
background:#09F;
}
#navmenu ul li a{
text-align:center;
text-decoration:none;
font-family:Arial, Helvetica, sans-serif;
height:30px;
width:150px;
display:block;
color:#000066;
padding-top:7px;
}
#navmenu ul ul{
position:absolute;
visibility: hidden;
top:30px;
}
#navmenu ul li:hover ul {
visibility:visible;
}
#navmenu li:hover {
background:#3366CC;
}
#navmenu ul li:hover ul li a:hover{
background:#03C;
color:#FFFFFF;
}
Database for recursive menu:
The result is without using div element (id=wrapper,id=navmenu) is working well, see:
When i put back div elements (id=wrapper,id=navmenu), its not happen what i want:
I want: when my cursor on "Felso menu" show the dropdown menu (Sport, Ekszer, Egyeb), and if my cursor on "Foci" show the dropdown menu (Mezek, Egyeb, Utok, Labdak), etc... Any ideas how can I do that, or how to fix my code?

Answer 1

Ok. I sloved this problem, here is my code:
function get_menu_tree($parent_id)
{
global $conn;
$menu = "";
$sqlquery = " SELECT * FROM menu where parent_id='" .$parent_id . "' ";
$res=mysqli_query($conn,$sqlquery);
while($row=mysqli_fetch_array($res,MYSQLI_ASSOC))
{
$menu .="<li><a href='".$row['link']."'>".$row['name']."</a>";
$menu .= "<ul>".get_menu_tree($row['id'])."</ul>"; //call recursively
$menu .= "</li>";
}
return $menu;
}