foreach ($cat_hierarchy as $cat) {

    loopItemPrice($cat, 1);

    foreach ($cat->children as $children_2) {

        loopItemPrice($children_2, 2);

        foreach ($children_2->children as $children_3) {

            loopItemPrice($children_3, 3);

            foreach ($children_3->children as $children_4) {

                loopItemPrice($children_4, 4);


            }
        }
    }
}

 function getValueArrayComplexity($arr, $count = 1)
{
    $count++;
    foreach ($arr->children as $val) {
        if (!is_object($arr->children)) {
            loopItemPrice($val, $count);
            getValueArrayComplexity($val);
        }
    }

}

foreach ($cat_hierarchy as $cat) {
    loopItemPrice($cat, 1);
    getValueArrayComplexity($cat);
}