I have a problem in multi-level menu creation

I'm creating a multi-level menu in php is pretty good but the problem arises when loading the sub-levels

<?php
$items = array(
    array(
        'idcategoria' => 1,
        'nombre' => 'Pinturas',
        'padre_id' => "0"
    ),
    array(
        'idcategoria' => 2,
        'nombre' => 'Iluminacion',
        'padre_id' => "0"
    ),
    array(
        'idcategoria' => 2,
        'nombre' => 'Ilumssinacion',
        'padre_id' => "1"
    )
);
$id    = "";
echo "<ul class='top-level-menu'>";
foreach ($items as $item) {
    if ($item['padre_id'] == 0) {
        echo "<li>" . $item['nombre'];
        $id = $item['idcategoria'];
        sub($items, $id);
        echo "</li>";
    }
}
echo "</ul>";
function sub($items, $id)
{
    echo "<ul>";
    foreach ($items as $item) {
        if ($item['padre_id'] == $id) {
            echo "<li class=''>" . $item['nombre'];
            sub($item, $item['idcategoria']);
            echo "</li>";
        }
    }
    echo "</ul>";
}
?>
<style>
.third-level-menu{
position: absolute;
 top: 0;
    right: -150px;
    width: 150px;
    list-style: none;
    padding: 0;
    margin: 0;
    display: none;
}

.third-level-menu > li
{
    height: 30px;
    background: #999999;
}
.third-level-menu > li:hover { background: #CCCCCC; }

.second-level-menu
{
    position: absolute;
    top: 30px;
    left: 0;
    width: 150px;
    list-style: none;
    padding: 0;
    margin: 0;
    display: none;
}

.second-level-menu > li
{
    position: relative;
    height: 30px;
    background: #999999;
}
.second-level-menu > li:hover { background: #CCCCCC; }

.top-level-menu
{
    list-style: none;
    padding: 0;
    margin: 0;
}

.top-level-menu > li
{
    position: relative;
    float: left;
    height: 30px;
    width: 150px;
    background: #999999;
}
.top-level-menu > li:hover { background: #CCCCCC; }

.top-level-menu li:hover > ul
{
    /* On hover, display the next level's menu */
    display: inline;
}


/* Menu Link Styles */

.top-level-menu a /* Apply to all links inside the multi-level menu */
{
    font: bold 14px Arial, Helvetica, sans-serif;
    color: #FFFFFF;
    text-decoration: none;
    padding: 0 0 0 10px;

    /* Make the link cover the entire list item-container */
    display: block;
    line-height: 30px;
}
.top-level-menu a:hover { color: #000000; }
</style>