<?php

$date_now = date('Y-m-d');

$result = $db->query("SELECT * FROM curr WHERE date = '$date_now'");
if($result->num_rows) {
	while($row = $result->fetch_array(MYSQLI_ASSOC)) {
		$xml = $row['xml'];
	}
}
else {
	$xml = file_get_contents('http://www.nationalbank.kz/rss/rates_all.xml');
	$db->query("INSERT INTO curr (date, xml) VALUES ('$date_now', '$xml')");
}

if(count($expltext) > 2) {
	$expltext[1] = strtoupper($expltext[1]);
	$expltext[2] = strtoupper($expltext[2]);

	$curr1 = preg_replace('/.+?<title>' . $expltext[1] . '<\/title><pubDate>.+?<\/pubDate><description>(.+?)<\/description>.+/', '$1', $xml);
	$curr2 = preg_replace('/.+?<title>' . $expltext[2] . '<\/title><pubDate>.+?<\/pubDate><description>(.+?)<\/description>.+/', '$1', $xml);

	$curr1 = ($expltext[1] == 'KZT') ? 1 : $curr1;
	$curr2 = ($expltext[2] == 'KZT') ? 1 : $curr2;

	$response = '1' . $expltext[1] . ' = ' . ($curr2 / $curr1) . $expltext[2];
}
else {
	$response = '/lazy';
}