[转载] php用csv文件导出大量数据

header ( "Content-type:application/vnd.ms-excel" );
header ( "Content-Disposition:filename=" . iconv ( "UTF-8", "GB18030", "query_user_info" ) . ".csv" );  

// 打开PHP文件句柄，php://output 表示直接输出到浏览器
$fp = fopen('php://output', 'a');   

// 将中文标题转换编码，否则乱码
foreach ($column_name as $i => $v) {
       $column_name[$i] = iconv('utf-8', 'GB18030', $v);
   }
   // 将标题名称通过fputcsv写到文件句柄
   fputcsv($fp, $column_name);  

$pre_count = 10000;
for ($i=0;$i<intval($total_export_count/$pre_count)+1;$i++){
    $export_data = $db->getAll($sql." limit ".strval($i*$pre_count).",{$pre_count}");
    foreach ( $export_data as $item ) {
        $rows = array();
        foreach ( $item as $export_obj){
            $rows[] = iconv('utf-8', 'GB18030', $export_obj);
        }
        fputcsv($fp, $rows);
    }  

    // 将已经写到csv中的数据存储变量销毁，释放内存占用
       unset($export_data);
       ob_flush();
       flush();
}  

exit (); 

转自： http://blog.csdn.net/cdy102688/article/details/21395835