<?php
$ch = curl_init("http://www.google.com/");
$fp = fopen("google_homepage.txt", "w");
curl_setopt($ch, CURLOPT_FILE, $fp);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_exec($ch);
curl_close($ch);
fclose($fp);
?>
After you execute or load this page the script will create a google_homepage.txt within the same directory that includes the source of the Google homepage. If you see the text file populated with the html source code of google.com, cURL is working.
