展示效果
/** * PHP递归实现无限级分类并展示 */ class getCatListClass { public function index(){ $data[] = ['cat_id'=>1,'cat_name'=>'金融业','parent_id'=>0]; $data[] = ['cat_id'=>2,'cat_name'=>'证劵/基金','parent_id'=>1]; $data[] = ['cat_id'=>3,'cat_name'=>'会计/审计/税务','parent_id'=>1]; $data[] = ['cat_id'=>4,'cat_name'=>'理财与财务服务','parent_id'=>2]; $data[] = ['cat_id'=>5,'cat_name'=>'建筑/房地产','parent_id'=>0]; $data[] = ['cat_id'=>6,'cat_name'=>'物业管理/商业中心','parent_id'=>5]; $data[] = ['cat_id'=>7,'cat_name'=>'房地产','parent_id'=>5]; $data[] = ['cat_id'=>8,'cat_name'=>'建筑工程','parent_id'=>7]; $data[] = ['cat_id'=>9,'cat_name'=>'建筑工程1','parent_id'=>8]; $data[] = ['cat_id'=>10,'cat_name'=>'建筑工程2','parent_id'=>8]; $arr = $this->getList($data, 0); $this->showList($arr); } /** * 组装成树形结构 * @param $data * @param $pid * @return array */ private function getList($data, $pid){ $list = []; foreach ($data as $val) { if ($val['parent_id'] == $pid) { $val['list'] = $this->getList($data, $val['cat_id']); if (empty($val['list'])) { unset($val['list']); }else{ foreach($val['list'] as $key=>$value){ $val['list'][$key]['depth'] = $this->getdepth($data,$value['parent_id'],0); } } $list[] = $val; } } return $list; } /** * 计算深度 * @param $arr * @param $pid * @param $depth * @return int */ private function getDepth($data,$pid,$depth){ foreach($data as $value){ if(empty($pid)){ break; } if($value['cat_id'] == $pid){ $depth+=1; $depth = $this->getDepth($data,$value['parent_id'],$depth); } } return $depth; } /** * show * @param $list */ private function showList($list){ foreach ($list as $val) { if(isset($val['depth'])){ for ($i = 0; $i < $val['depth']; $i++) { echo "——"; } } echo $val['cat_name'] . "<br/>"; if (isset($val['list'])) { $this->showList($val['list']); } } } }