$csv_data = '';
/* 标题 /
$nums = count($title_arr);

for ($i = 0; $i < $nums - 1; ++$i) {
$csv_data .= '"' . $title_arr[$i] . '",';
}
if ($nums > 0) {
$csv_data .= '"' . $title_arr[$nums - 1] . "\"\r\n";
}

foreach ($data as $k => $row) {
foreach ($row as $key => $r){

  $row[$key] = str_replace("\"","\"\"",$r);

  $csv_data .= "\"\t" . $row[$key] . '",';
}

$csv_data .= '"' . $row[$nums - 1] . "\"\r\n";
unset($data[$k]);

}
$csv_data = mb_convert_encoding($csv_data,"cp936","UTF-8");
$file_name = empty($file_name) ? date('Y-m-d-H-i-s',time()) : $file_name;
if (strpos($_SERVER['HTTP_USER_AGENT'],"MSIE")) { // 解决IE浏览器输出中文名乱码的bug
$file_name = urlencode($file_name);
$file_name = str_replace('+','%20',$file_name);
}
$file_name = $file_name . '.csv';
header('Content-Type: application/download');
header("Content-type:text/csv;");
header("Content-Disposition:attachment;filename=" . $file_name);
header('Cache-Control:must-revalidate,post-check=0,pre-check=0');
header('Expires:0');
header('Pragma:public');
echo $csv_data;
exit();
}