php 分组

记录集:

array(11) {
  [0] => array(3) {
    ["id"] => int(16)
    ["cid"] => int(36)
    ["qid"] => int(27)
  }
  [1] => array(3) {
    ["id"] => int(17)
    ["cid"] => int(36)
    ["qid"] => int(26)
  }
  [2] => array(3) {
    ["id"] => int(18)
    ["cid"] => int(37)
    ["qid"] => int(25)
  }
  [3] => array(3) {
    ["id"] => int(19)
    ["cid"] => int(37)
    ["qid"] => int(24)
  }
  [4] => array(3) {
    ["id"] => int(20)
    ["cid"] => int(38)
    ["qid"] => int(23)
  }
  [5] => array(3) {
    ["id"] => int(21)
    ["cid"] => int(38)
    ["qid"] => int(22)
  }
  [6] => array(3) {
    ["id"] => int(22)
    ["cid"] => int(39)
    ["qid"] => int(21)
  }
  [7] => array(3) {
    ["id"] => int(23)
    ["cid"] => int(39)
    ["qid"] => int(20)
  }
  [8] => array(3) {
    ["id"] => int(24)
    ["cid"] => int(40)
    ["qid"] => int(19)
  }
  [9] => array(3) {
    ["id"] => int(25)
    ["cid"] => int(40)
    ["qid"] => int(18)
  }
  [10] => array(3) {
    ["id"] => int(26)
    ["cid"] => int(40)
    ["qid"] => int(17)
  }
}

根据CID来分组，同时列出CID所有QID数据

函数group_arr：

    function group_arr($dataArr,$keyStr)
    {
        $newArr=[];
        $qid= [];

        foreach ($dataArr as $k => $val) {    //数据根据日期分组
            $newArr[$val[$keyStr]][] = $val;
            // $newArr[$val[$keyStr]]['qids'] 
        }
        
        return $newArr;
    }

代码：

        $sdflks=Db::name('xxxd')
        ->field('id,cid,qid')
        ->where('pid',$pid)
        ->select();
        $dxzsfs=group_arr($sdflks,'cid');
        dump($dxzsfs);exit;

结果:

array(5) {
  [36] => array(2) {
    [0] => array(3) {
      ["id"] => int(16)
      ["cid"] => int(36)
      ["qid"] => int(27)
    }
    [1] => array(3) {
      ["id"] => int(17)
      ["cid"] => int(36)
      ["qid"] => int(26)
    }
  }
  [37] => array(2) {
    [0] => array(3) {
      ["id"] => int(18)
      ["cid"] => int(37)
      ["qid"] => int(25)
    }
    [1] => array(3) {
      ["id"] => int(19)
      ["cid"] => int(37)
      ["qid"] => int(24)
    }
  }
  [38] => array(2) {
    [0] => array(3) {
      ["id"] => int(20)
      ["cid"] => int(38)
      ["qid"] => int(23)
    }
    [1] => array(3) {
      ["id"] => int(21)
      ["cid"] => int(38)
      ["qid"] => int(22)
    }
  }
  [39] => array(2) {
    [0] => array(3) {
      ["id"] => int(22)
      ["cid"] => int(39)
      ["qid"] => int(21)
    }
    [1] => array(3) {
      ["id"] => int(23)
      ["cid"] => int(39)
      ["qid"] => int(20)
    }
  }
  [40] => array(3) {
    [0] => array(3) {
      ["id"] => int(24)
      ["cid"] => int(40)
      ["qid"] => int(19)
    }
    [1] => array(3) {
      ["id"] => int(25)
      ["cid"] => int(40)
      ["qid"] => int(18)
    }
    [2] => array(3) {
      ["id"] => int(26)
      ["cid"] => int(40)
      ["qid"] => int(17)
    }
  }
}