Add new rows to existing CSV without editing it and Download new one.

edit_csv_and_download_new.php

<?php 

/*
 *      Author : TechnoKnol
 *      Blog : http://technoknol.blogspot.com
 *      
 */

header("Content-type: text/csv");
header("Content-Disposition: attachment; filename=file.csv");
header("Pragma: no-cache");
header("Expires: 0");


$file = fopen("csv.csv","r");
$list = array();

while(! feof($file))
  {
      $list[] = (fgetcsv($file));
  }
fclose($file);

$list[] = array('name5', 'town5');
$list[] = array('name6', 'town6');

$list = array_filter($list);
outputCSV($list);

function outputCSV($list) {
    $output = fopen("php://output", "w");

    foreach ($list as $row) {
        fputcsv($output, $row);
    }
    fclose($output);
}
?>