PHP递归实现无限级分类并展示

来源：互联网发布：如果张作霖不死知乎编辑：程序博客网时间：2024/05/17 07:19
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']);            }        }    }}
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