PHP数据分类汇总

    /**
     * 二维数据分类汇总
     * @description:根据数据 
     * @param {dataArr:需要分组的数据；keyStr:分组依据键值} 
     * @return: 
     */
    public function dataGroup(array $dataArr, $keyStr)
    {
        $newArr = [];
        foreach ($dataArr as $k => $val) {    //数据根据日期分组
            $newArr[$val[$keyStr]][] = $val;
        }

        $ret = array();
        foreach ($dataArr as $key => $value) {
            array_push($ret, $value);
        }
        return $newArr;
    }