Thinkphp导出csv格式文件

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public function datacsv(){
   $result=M('user')->select();

    $str = "姓名,年龄\n";
    $str = iconv('utf-8','gb2312',$str);

    foreach($result as $key=>$val){
        
        $name = iconv('utf-8','gb2312',$val['name']); //转换编码
        $age=is_numeric($val['age'])?$val['age']."\t":$val['age'];   //将数字不让科学记数法转换
        $str .= $name.",".$age."\n";
    }

    $fileName = date('Ymd').'.csv';
    $this->export_csv($fileName,$str);
    exit;
}

public function export_csv($filename, $data){
    header("Content-type:text/csv");
    header("Content-Disposition:attachment;filename=".$filename);
    header('Cache-Control:must-revalidate,post-check=0,pre-check=0');
    header('Expires:0');
    header('Pragma:public');
    echo $data;

}