导出csv文件

/** * export excel */public function exportExcel($data,$userarr){    header("Content-type:application/vnd.ms-excel;charset=utf-8");    header("Content-Disposition:attachment;filename=Export_test.csv");    $tab=","; $br="\n";$tabMoney=",";    $head = "a" . $tab ."b";    //输出内容如下：    echo  iconv("UTF-8","GBK",$head).$br;    foreach ($data as $k => $v)    {       echo  iconv("UTF-8","GBK",$v['a']).$tab;        echo  iconv("UTF-8","GBK",$v['b']).$tab . $br;    }}