Calling Card App

dial-input.php

<?php
header("content-type: text/xml");
echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";
?>

<Response>
    <Gather action="handle-input.php" method="POST">
    <Say>Thanks for using the phone card app. Please dial the number you'd like to call. Dial the area code and full seven digits.</Say>
    </Gather>
</Response>

handle-input.php

<?php

if (preg_match('/^\d{10}$/', $_REQUEST['Digits'])) {
       include("inbound-call.xml");
    } else {
       include("dial-input.php");
    }

handle_input.php

<?php
header("content-type: text/xml");
echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";
?>
<Response>
    <Dial>$_REQUEST['Digits']</Dial>
    <Say>The call failed or the called party hung up. Goodbye.</Say>
</Response>