cURL is a tool for transferring data with URL syntax. It support HTTP, FTP, SCP and many others(curl >= 7.19.4). Remember, you need to install and enable the cURL extension to use it.
// a little script check is the cURL extension loaded or not
if(!extension_loaded("curl")) {
die("cURL extension not loaded! Quit Now.");
}
// Actual script start
// create a new cURL resource
// $curl is the handle of the resource
$curl = curl_init();
// set the URL and other options
curl_setopt($curl, CURLOPT_URL, "http://www.example.com");
// execute and pass the result to browser
curl_exec($curl);
// close the cURL resource
curl_close($curl);