Simply set URL and execute cURL request. Let see the bellow example.
$url = "https://www.example.com";
$curl = curl_init();
curl_setopt($curl,CURLOPT_URL,$url);
curl_setopt($curl,CURLOPT_RETURNTRANSFER,true);
$result = curl_exec($curl);
curl_close($curl);
var_dump($result);