$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();