php快速导出csv格式数据程序代码

$exportdata = '规则111,有效期'."＼n";

header("Content-type:application/vnd.ms-excel");
header("Content-Disposition: attachment; filename=$filename");

$exportdata = '规则111,规则222,审222,规222,服2222,规则1,规则2,规则3,匹配字符,设置时间,有效期'."＼n";
$date = date("YmdHis");
if (!empty($lists)){
    foreach($lists as $key => $value){
      $time = date("Y-m-d_H:i:s", $value['add_time']);
      $exportdata .= "＼"＼t".$value['Rule_id']."＼",＼"＼t".$value['Rule_name']."＼",＼"＼t".$value['Matching_level']."＼",＼"＼t"."{$value['Rule_action']}"."＼",＼"＼t".$value['Service_type']."＼",＼"＼t".$value['Keyword1']."＼",＼"＼t".$value['Keyword2']."＼",＼"＼t".$value['Keyword3']."＼",＼"＼t".$value['Matching_word']."＼",＼"＼t".$value['Set_time']."＼",＼"＼t".$value['Validation_time']."＼"＼n";
    }
}
$filename = "plcnetinfo_{$date}.csv";
header("Content-type:application/vnd.ms-excel");
header("Content-Disposition: attachment; filename=$filename");
header("Expires: 0");
header("Pragma: public");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Cache-Control: public");
     
echo(mb_convert_encoding($exportdata,"gb2312","UTF-8"));

<?php
export_csv();
function export_csv() {
$filename = date('YmdHis').".csv";//文件名
header("Content-type:text/csv");
header("Content-Disposition:attachment;filename=".$filename);
header('Cache-Control:must-revalidate,post-check=0,pre-check=0');
header('Expires:0');
header('Pragma:public');
echo array_to_string(get_export_data());
}
function array_to_string($result) {
if(empty($result)) {
return i("没有符合您要求的数据！^_^");
}
$data = '书ID,书名'."＼n"; //栏目名称
$size_result = sizeof($result);
for($i = 0 ; $i < $size_result ; $i++) {
$data .= i($result[$i]['name']).','.i($result[$i]['option'])."＼n";
}
return $data;
}
function get_export_data() {
$link = mysql_connect('localhost','root','121051xz') or die(mysql_error());
mysql_select_db('ht');
mysql_query("set names 'utf8'");//定义编码
$sql = 'select * from booklist';
$result = mysql_query($sql);
$rowaa = mysql_fetch_array($result);
$res = array();
$i = 0;
while($row = mysql_fetch_array($result)) {
$res[$i]['name'] = $row['bookid'];
$res[$i]['option'] = $row['bookname'];
$i++;
}
return $res;
}
function i($strInput) {
return iconv('utf-8','gb2312',$strInput);//页面编码为utf-8时使用，否则导出的中文为乱码
}