How to dynamically generate a CSV with PHP

csv-download.php

<?php
$filename = 'test.csv';
$now      = gmdate( 'D, d M Y H:i:s' );
header( 'Expires: Tue, 03 Jul 2001 06:00:00 GMT' );
header( 'Cache-Control: max-age=0, no-cache, must-revalidate, proxy-revalidate' );
header( "Last-Modified: {$now} GMT" );

// force download
header( 'Content-Type: application/force-download' );
header( 'Content-Type: application/octet-stream' );
header( 'Content-Type: application/download' );

// disposition / encoding on response body
header( "Content-Disposition: attachment;filename={$filename}" );
header( 'Content-Transfer-Encoding: binary' );

ob_start();
$file = fopen( 'php://output', 'w' );

$headers = array( 'Fee', 'Fi', 'Fo', 'Fum' );
fputcsv( $file, $headers );

$data = array(
	array(
		'One',
		'One',
		'One',
		'One',
	),
	array(
		'Two',
		'Two',
		'Two',
		'Two',
	),
	array(
		'Three',
		'Three',
		'Three',
		'Three',
	),
);
foreach ( $data as $row ) {
	fputcsv( $file, (array) $row );
}
fclose( $file );
echo ob_get_clean();
die();