How to get categorychildren in a list under topcategories

Question

I want a list of categories with under each categoryname their children categories. But my code isn't working, the top categories are showing but

<ul class="sub"></ul>

is empty, so the children are not showing.

This is my code:

$categoryCollection = Mage::getResourceModel('catalog/category_collection')
->addFieldToFilter('level',2)
->addAttributeToSelect('name')
->addAttributeToSelect('url');
$out = "<ul>";
foreach($categoryCollection as $cat){
    $children = $cat->getChildren();
    $out .= "<li>";
    $out .= "<b><a href='".$cat->getUrl()."'>".$cat->getName()."</a></b>";
        $out .="<ul class='sub'>";
        foreach($children as $child){
            $ChildModel = Mage::getModel('catalog/category')->load($child)
            ->addAttributeToSelect('name');
            $out .="<li><a href='".$ChildModel->getUrl()."'>".$ChildModel->getName()."</a></li>";
        }
        $out .="</ul>";
    $out .= "</li>";
}
$out .= "</ul>";
echo $out;

Answer 1

Replace below code with your code:

$out .="<ul class='sub'>";
$children = Mage::getModel('catalog/category')->load($children->getId())->getChildrenCategories();

    foreach($children as $child){

        $out .="<li><a href='".$child->getUrl()."'>".$child->getName()."</a></li>";
    }
    $out .="</ul>";

Edit this line:

$children = Mage::getModel('catalog/category')->load($cat->getId())->getChildrenCategories();

[Edit]

You want show only current product parent categories? right?

click here

This may help you.