通过mysqloutfile直接快速导出.csv文件，适用于量级很大的导出操作

直接从中直接导出csv，给你我的，供你参考

$t=time();

$filepath= getcwd().'/';

$filename=$t.'.csv';

$where='1=1';

$sql="select

field1,

filed2,

filed3

from

db.表头表

union all

select

field1,

filed2,

filed3

from

db.数据表

where

$where into outfile '$filepath$filename' character

set gbk fields terminated by ',' optionally enclosed by '\"' escaped by '\"' lines terminated by '\\r\\n' ";";

$query = db::query($sql);

header('content-description: file transfer');

header('content-type: application/octet-stream');

header('content-disposition: attachment; filename=业务日志.csv');

header('content-transfer-encoding: binary');

header('expires: 0');

header('cache-control: must-revalidate, post-check=0, pre-check=0');

header('pragma: public');

header('content-length: ' . filesize($filepath.$filename));

readfile($filepath.$filename);

unlink($filepath.$filename);