<?php

function array2csv(array &$array) {
	if (count($array) == 0) {
		return null;
	}
	ob_start();
	$df = fopen("php://output", 'w');
	fputcsv($df, array_keys(reset($array)));
	foreach ($array as $row) {
		fputcsv($df, $row);
	}
	fclose($df);
	return ob_get_clean();
}

function download_send_headers($filename) {
	// disable caching
	$now = gmdate("D, d M Y H:i:s");
	header("Expires: Tue, 03 Jul 2001 06:00:00 GMT");
	header("Cache-Control: max-age=0, no-cache, must-revalidate, proxy-revalidate");
	header("Last-Modified: {$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");
}

include('db.php');
$db = new DataBase();
if (!$db->isInit()) {
	echo 'Error db init';
	return;
}

if (!isset($_GET['id'])) {
	echo json_encode(false);
}
$id = $_GET['id'];

download_send_headers("data_export_" . date("Y-m-d") . ".csv");
echo array2csv($db->getWordsList($id));
die();