PHP导出CSV

    set_time_limit(0);
        ob_end_clean();
        header("Content-Type: application/force-download");  
        header("Content-type:text/csv;charset=utf-8");  
        header("Content-Disposition:filename=文件名".date("Y-m-d").".csv");
        ob_end_flush(); 
        echo "标题1,标题2,标题3\r";
        echo "数据1,数据2,数据3\r";