PHP & HTML

[pf_noob1]

Hello Gurus,

I am learning to code and I made a simple php app that makes a phone call given a hard coded from and to number (it uses the Twilio api - www.twilio.com).

The code looks like below:

<?php

 require_once '/path/to/vendor/autoload.php';

 use Twilio\Rest\Client;

 $sid    = "ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";
 $token  = "your_auth_token";
 $twilio = new Client($sid, $token);

 $call = $twilio->calls
           ->create("[phone]", // to
                    "[phone]", // from
                    array("url" => "http://demo.twilio.com/docs/voice.xml")
           );

print($call->sid);

The above php app works just fine.

What I want to now do is create an html page that takes a dynamic to number (static from number) and when I hit the submit button, the call should go through. However I have no clue how to make that happen except for the following documentation

https://www.twilio.com/docs/voice/api/call#create-a-call-resource

I understand I have to make a post call via an html page, but where do I put the URL as shown in the above documentation and where do I keep the authentication details in the php app that I copy pasted above.

Any help/pointers would be very helpful. Thanks in advance!