메모리 제한을 초과하지 않고 Curl을 사용하여 대용량 파일을 다운로드하는 방법은 무엇입니까?

<?php
set_time_limit(0);
// Set the path to the target file
$fp = fopen(dirname(__FILE__) . '/localfile.tmp', 'w+');
// Exchange spaces with %20 to ensure compatibility with URLs
$ch = curl_init(str_replace(" ", "%20", $url));
// Extend the timeout value to accommodate large files
curl_setopt($ch, CURLOPT_TIMEOUT, 600);
// Directs curl to write response to file
curl_setopt($ch, CURLOPT_FILE, $fp);
// Automatically follows redirects
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
// Send request and receive response
curl_exec($ch);
curl_close($ch);
fclose($fp);
?>