$arr = array('');//  目标数组

        header("Content-Type:application/vnd.ms-excel;charset=gbk");

        header("Content-Disposition: attachment;filename='文件.csv'");

        header('Cache-Control: max-age=0');

        $fp = fopen('php://output', 'a');

        $head = array('手机号', '姓名','职位', '公司');

        foreach ($head as $i => $v) {

            $head[$i] = iconv('utf-8', 'gbk', $v);

        }

        fputcsv($fp, $head);

        foreach($arr as $vv){

            $row = [$vv['phone'],$vv['username'],$vv['job'],($vv['company'])];

            foreach ($row as $key => $val) {

                $row[$key] = iconv('utf-8', 'gbk', $val);

            }

            fputcsv($fp, $row);

        }

        ob_flush();

        flush();