先按部门排序取出无限极架构数据(此时为一维数组),并将每个员工以”Satff”健值放入对应部门数组中,并将人数使用count以健值statistics放入数组中,此时数据为

[
  {
    “depart_id”: 1,
    “customer_id”: 41,
    “parent_id”: 0,
    “statistics”: 0,
    “Staff”: []
  },
  {
    “depart_id”: 2,
    “customer_id”: 41,
    “parent_id”: 1,
    “statistics”: 6,
    “Staff”: [
      {
        “real_name”: “李四”
      },
      {
        “real_name”: “999”
      },
      {
        “real_name”: “234”
      },
      {
        “real_name”: “李四”
      },
      {
        “real_name”: “1231111”
      },
      {
        “real_name”: “测试23”
      }
    ]
  },
  {
    “depart_id”: 3,
    “customer_id”: 41,
    “parent_id”: 1,
    “statistics”: 1,
    “Staff”: [
      {
        “real_name”: “张三2”
      }
    ]
  },
  {
    “depart_id”: 4,
    “customer_id”: 41,
    “parent_id”: 1,
    “statistics”: 5,
    “Staff”: [
      {
        “real_name”: “yz测试专用1”
      },
      {
        “real_name”: “yz测试003”
      },
      {
        “real_name”: “yz测试00666”
      },
      {
        “real_name”: “yz测试010”
      },
      {
        “real_name”: “yz测试009”
      }
    ]
  },
  {
    “depart_id”: 5,
    “customer_id”: 41,
    “parent_id”: 1,
    “statistics”: 1,
    “Staff”: [
      {
        “real_name”: “张三11”
      }
    ]
  },
  {
    “depart_id”: 6,
    “customer_id”: 41,
    “parent_id”: 1,
    “statistics”: 0,
    “Staff”: []
  },
  {
    “depart_id”: 7,
    “customer_id”: 41,
    “parent_id”: 2,
    “statistics”: 0,
    “Staff”: []
  },
  {
    “depart_id”: 8,
    “customer_id”: 41,
    “parent_id”: 2,
    “statistics”: 9,
    “Staff”: [
      {
        “real_name”: “11111(详细)”
      },
      {
        “real_name”: “122”
      },
      {
        “real_name”: “张三三1111111111”
      },
      {
        “real_name”: “张三三”
      },
      {
        “real_name”: “张三三”
      },
      {
        “real_name”: “1212”
      },
      {
        “real_name”: “张三三”
      },
      {
        “real_name”: “11111”
      },
      {
        “real_name”: “zhansan”
      }
    ]
  },
  {
    “depart_id”: 9,
    “customer_id”: 41,
    “parent_id”: 1,
    “statistics”: 0,
    “Staff”: []
  },
  {
    “depart_id”: 10,
    “customer_id”: 41,
    “parent_id”: 1,
    “statistics”: 0,
    “Staff”: []
  },
  {
    “depart_id”: 11,
    “customer_id”: 41,
    “parent_id”: 1,
    “statistics”: 0,
    “Staff”: []
  },
  {
    “depart_id”: 17,
    “customer_id”: 41,
    “parent_id”: 7,
    “statistics”: 0,
    “Staff”: []
  },
  {
    “depart_id”: 18,
    “customer_id”: 41,
    “parent_id”: 3,
    “statistics”: 1,
    “Staff”: [
      {
        “real_name”: “yz001”
      }
    ]
  },
  {
    “depart_id”: 23,
    “customer_id”: 41,
    “parent_id”: 1,
    “statistics”: 2,
    “Staff”: [
      {
        “real_name”: “张三”
      },
      {
        “real_name”: “萨达”
      }
    ]
  },
  {
    “depart_id”: 24,
    “customer_id”: 41,
    “parent_id”: 1,
    “statistics”: 0,
    “Staff”: []
  }
]

以上数据已变量 $arrDepartment  为例,然后为了破坏原有排序,将 数据放入临时变量,重新排序一下数据,具体如下

// 为了不破坏原来排序,使用临时变量
$arrDepartmentTmp = $arrDepartment;
// 按照子集ID从大到小重新排序
$arrTmp = array_column($arrDepartmentTmp, 'parent_id');
array_multisort($arrTmp, SORT_DESC, $arrDepartmentTmp);
// 为了还原排序,临时变量与原有变量均用他ID作为健值
$arrDepartmentTmp = array_column($arrDepartmentTmp, null, 'depart_id');
$arrDepartment = array_column($arrDepartment, null, 'depart_id');

然后进行人数统计累加

// 使用父级ID作为健值进行统计人数
foreach ($arrDepartmentTmp as $intDepartmentKey => &$arrDepartmentItem) {
//如果他父级ID为0,那意味着它是最高层,所以跳过
    if ($arrDepartmentItem['parent_id'] != 0) {
//将它的人数加到他父级的人数统计中
        $arrDepartmentTmp[$arrDepartmentItem['parent_id']]['statistics'] += $arrDepartmentItem['statistics'];
    }
}

还原原来的排序

// 为了不破坏排序,按照原来排序重新组装
foreach ($arrDepartmentTmp as $k => $item) {
    $arrDepartment[$k] = $item;
}
unset($arrDepartmentTmp);

转为树形数据

$arrTree = toTree($arrDepartment, 'depart_id', 'parent_id');

toTree函数在这
https://www.bugquit.com/487.html