for the essence of development and testing, You have two options to a quick fix
- Use
$client = new GuzzleHttp\Client();
$request = $client->request('GET',$url, ['verify' => false]); //where $url is your http address
- follow @Pham Huy Anh answer's above then do this
$client = new GuzzleHttp\Client();
$request = $client->request('GET',$url, ['verify' => 'C:\xampp\php\extras\ssl\cacert.pem']);
Hope it helps someone.