php导出csv格式数据实现：
先定义一个字符串 存储内容，例如
$exportdata = '规则111,规则222,审222,规222,服2222,规则1,规则2,规则3,匹配字符,设置时间,有效期'."n";
然后对需要保存csv的数组进行foreach循环，例如
if (!empty($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";
}
}
csv格式的内容用','隔开，在现实的时候就能分格了。每一行后面就一个'n'就能分行了。
然后在后面执行输出就行了。例如
$filename = "plcnetinfo_{$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"));
但是在导出数字的时候csv就会把前面的0去掉，例如 我想显示 00001 ，如果输出的话就会显示1.这种解决办法就是在输出的时候就一个'"t',这个是制表符，会显示成空格。就能把数值转化成文本了。不过在导入的时候会出现'" '.这种东西，用一下php自带的trim函数就好了。完整代码如下：
//var_dump($sql);
$lists = $this->dbo->query($sql);
$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"));