set_time_limit(0);
$fp = fopen (‘./products.xml’, ‘w+’);
$ch = curl_init(‘http://siteurl……’);// or any url you can pass which gives you the xml
curl_setopt($ch, CURLOPT_TIMEOUT, 50);
curl_setopt($ch, CURLOPT_FILE, $fp);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_exec($ch);
curl_close($ch);
fclose($fp);