无限极分类(二)显示分类级别

数据表结构:

函数:

function tree($arr, $pid = 0, $level = 1){
　　static $arr2 = [];
　　foreach($arr as $v){
　　　　if($v['parent_id'] == $pid){
　　　　　　$v['level'] = $level;
　　　　　　$arr2[] = $v;
　　　　　　tree($arr, $v['cat_id'], $level+1);
　　　　}
　　}
　　return $arr2;
}

tree($list);

结果:

array(19) {
  [0] => array(6) {
    ["cat_id"] => string(1) "1"
    ["cat_name"] => string(6) "女装"
    ["parent_id"] => string(1) "0"
    ["sort_order"] => string(2) "50"
    ["is_show"] => string(1) "1"
    ["level"] => int(1)
  }
  [1] => array(6) {
    ["cat_id"] => string(1) "6"
    ["cat_name"] => string(9) "连衣裙"
    ["parent_id"] => string(1) "1"
    ["sort_order"] => string(2) "50"
    ["is_show"] => string(1) "1"
    ["level"] => int(2)
  }
  [2] => array(6) {
    ["cat_id"] => string(2) "31"
    ["cat_name"] => string(12) "我的最爱"
    ["parent_id"] => string(1) "6"
    ["sort_order"] => string(2) "50"
    ["is_show"] => string(1) "1"
    ["level"] => int(3)
  }

....