Method nestedToCheckBox

public static function nestedToCheckBox($data, $d, $currentCatid = 0, &$active = 0, $forceCategoryId = 0)
{
    $s = PhocacartRenderStyle::getStyles();
    $result = array();
    if (!empty($data) && count($data) > 0) {
        $result[] = '<ul class="ph-filter-module-category-tree">';
        foreach ($data as $k => $v) {
            $checked = '';
            $value = htmlspecialchars($v['alias']);
            if (isset($d['nrinalias']) && $d['nrinalias'] == 1) {
                $value = (int) $v['id'] . '-' . htmlspecialchars($v['alias']);
            }
            if (in_array($value, $d['getparams'])) {
                $checked = 'checked';
                $active = 1;
            }
            // This only can happen in category view (category filters are empty, id of category is larger then zero)
            // This is only marking the category as active in category list
            if (empty($d['getparams']) || isset($d['getparams'][0]) && $d['getparams'][0] == '') {
                // Empty parameters, so we can set category id by id of category view
                if ($forceCategoryId > 0 && (int) $forceCategoryId == (int) $v['id']) {
                    $checked = 'checked';
                    $active = 1;
                }
            }
            $count = '';
            // If we are in item view - one category is selected but if user click on filter to select other category, this one should be still selected - we go to items view with 2 selected
            // because force category is on
            if (isset($v['count_products']) && isset($d['params']['display_category_count']) && $d['params']['display_category_count'] == 1) {
                $count = ' <span class="ph-filter-count">' . (int) $v['count_products'] . '</span>';
            }
            $icon = '';
            if ($v['icon_class'] != '') {
                $icon = '<span class="' . PhocacartText::filterValue($v['icon_class'], 'text') . ' ph-filter-item-icon"></span> ';
            }
            $jsSet = '';
            if (isset($d['forcecategory']['idalias']) && $d['forcecategory']['idalias'] != '') {
                // Category View - force the category parameter if set in parameters
                $jsSet .= 'phChangeFilter(\'c\', \'' . $d['forcecategory']['idalias'] . '\', 1,  \'text\', 0, 1, 1);';
                // ADD IS FIXED ( use "text" as formType - it cannot by managed by checkbox, it is fixed - always 1 - does not depends on checkbox, it is fixed 1
            }
            $jsSet .= 'phChangeFilter(\'' . $d['param'] . '\', \'' . $value . '\', this, \'' . $d['formtype'] . '\',\'' . $d['uniquevalue'] . '\', 0, 1);';
            // ADD OR REMOVE
            $result[] = '<li><div class="' . $s['c']['controls'] . '">';
            $result[] = '<label class="ph-checkbox-container"><input class="' . $s['c']['inputbox.checkbox'] . '" type="checkbox" name="tag" value="' . $value . '" ' . $checked . ' onchange="' . $jsSet . '" />' . $icon . $v['title'] . $count . '<span class="ph-checkbox-checkmark"></span></label>';
            $result[] = '</div></li>';
            $result[] = self::nestedToCheckBox($v['children'], $d, $currentCatid, $active);
        }
        $result[] = '</ul>';
    }
    return implode("\n", $result);
}