纯PHP或CSS-树菜单仅显示活动节点

我找到了解决方案，以便生成带有多级子类别的菜单树，并仅显示已选择的级别（树中没有所有子级）。

绝招是那些线：

 if( //if the current subcateg parentid is on the parent that must be active then show his children's otherwise do not
                ( in_array($oneCateg['parentid'],$arrAllParents)  && in_array($oneCateg['id'],$arrAllParents))
            )

感谢您的帮助！

/** show all subcategs of the selected category
 * @param $iCategIDSelected
 * @param null $arrCategs
 * @param bool $bIsOnTheLeaf
 * @return string
 */
static function getHTMLCategsForMenuBySelected($iCategIDSelected, $arrCategs=null, $arrAllParents=null, $iLevel=0){

    $bIsVisible = false;
    if($arrCategs == null){
        $oController = new ShopcategoriesController();
        $arrCategs = $oController->getShopCategories(0);
    }

    //find if we make the current node visible or not
    //if the current node id is on the parent's of the selected node then make it visible
    //take all nodes starting with root until the selected node
    if($arrAllParents==null){
        $arrAllParents = ShopcategoriesController::getParentsBySelectedCategID($iCategIDSelected,$arrCategs);
        $arrAllParents[]=0;
    }

    $iLevel++;
    $sHTML = '<ul class="nav nav-pills nav-stacked level_'.$iLevel.'">';

    foreach($arrCategs as $oneCateg){
        //find if is active or not
        $bActiveClass = '';
        if(in_array($oneCateg['id'],$arrAllParents)){$bActiveClass = 'active';}

        $sHTML .= '<li class="'.$bActiveClass.'">';
        $sHTML .= '<a href="'.URL::to('showcategory/'.$oneCateg['id']).'" class="list-group-item">'.ucfirst($oneCateg['name']).'</a>';
        if(count($oneCateg['subCategories'])>0){
            if( //if the current subcateg parentid is on the parent that must be active then show his children's otherwise do not
                ( in_array($oneCateg['parentid'],$arrAllParents)  && in_array($oneCateg['id'],$arrAllParents))
            ) {
                $sHTML .= ShopcategoriesController::getHTMLCategsForMenuBySelected($iCategIDSelected, $oneCateg['subCategories'], $arrAllParents, $iLevel);
                $sHTML .= '</li>';
            }
        }else{
            $sHTML .= '';
        }
    }
    $sHTML .= '</ul>';
    return $sHTML;
}