jonmarkgo/call.php

## call.php
<?php
  require("Services/Twilio.php");
  require("database.php");

  // require POST request
  if ($_SERVER['REQUEST_METHOD'] != "POST") die;

  // generate "random" 6-digit verification code
  $code = rand(100000, 999999);

  // save verification code in DB with phone number
  // attempts to delete existing entries first
  $number = mysql_real_escape_string($_POST["phone_number"]);
  db(sprintf("DELETE FROM numbers WHERE phone_number='%s'", $number));
  db(sprintf("INSERT INTO numbers (phone_number, verification_code) VALUES('%s', %d)", $number, $code));

  mysql_close();

  // initiate phone call via Twilio REST API
  // Set our AccountSid and AuthToken
  $AccountSid = "ACxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
  $AuthToken = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";

  // Instantiate a new Twilio Rest Client
  $client = new Services_Twilio($AccountSid, $AuthToken);

  try {
    // make call
    $call = $client->account->calls->create(
      '+18881234567',                // Verified Outgoing Caller ID or Twilio number
      $number,                       // The phone number you wish to dial
      'http://example.com/twiml.php' // The URL of twiml.php on your server
    );
  } catch (Exception $e) {
    echo 'Error starting phone call: ' . $e->getMessage();
  }

  // return verification code as JSON
  $json = array();
  $json["verification_code"] = $code;

  header('Content-type: application/json');
  echo(json_encode($json));
?>

## database.php
<?php
  $db_host='localhost';
  $db_name='dbname';
  $db_user='dbuser';
  $db_passwd='dbpassword';

  mysql_connect($db_host, $db_user, $db_passwd)
    or die('Could not connect: ' . mysql_error());

  mysql_select_db($db_name) or die('Could not select database');

  function db($sql)
  {
    $result = mysql_query($sql) or die('Query failed: ' . mysql_error());
    return $result;
  }
?>

## dbschema.sql
--
-- Table structure for table `numbers`
--

CREATE TABLE IF NOT EXISTS `numbers` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `phone_number` varchar(50) DEFAULT NULL,
  `verification_code` int(11) DEFAULT NULL,
  `verified` tinyint(1) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;

## index.php
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <title>Phone Verification by Twilio</title>
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
    <script type="text/javascript">
      $(document).ready(function(){
        $("#enter_number").submit(function(e) {
          e.preventDefault();
          initiateCall();
        });
      });

      function initiateCall() {
        $.post("call.php", { phone_number : $("#phone_number").val() },
          function(data) { showCodeForm(data.verification_code); }, "json");
        checkStatus();
      }

      function showCodeForm(code) {
        $("#verification_code").text(code);
        $("#verify_code").fadeIn();
        $("#enter_number").fadeOut();
      }

      function checkStatus() {
        $.post("status.php", { phone_number : $("#phone_number").val() },
          function(data) { updateStatus(data.status); }, "json");
      }

      function updateStatus(current) {
        if (current === "unverified") {
          $("#status").append(".");
          setTimeout(checkStatus, 3000);
        }
        else {
          success();
        }
      }

      function success() {
        $("#status").text("Verified!");
      }
    </script>
  </head>
  <body>
    <form id="enter_number">
      <p>Enter your phone number:</p>
      <p><input type="text" name="phone_number" id="phone_number" /></p>
      <p><input type="submit" name="submit" value="Verify" /></p>
    </form>

    <div id="verify_code" style="display: none;">
      <p>Calling you now.</p>
      <p>When prompted, enter the verification code:</p>
      <h1 id="verification_code"></h1>
      <p><strong id="status">Waiting...</strong></p>
    </div>
  </body>
</html>

## status.php
<?php
  require("database.php");

  // require POST request
  if ($_SERVER['REQUEST_METHOD'] != "POST") die;

  $number = mysql_real_escape_string($_POST["phone_number"]);
  $result = db(sprintf("select * from numbers where phone_number='%s'", $number));

  $json = array();
  $json["status"] = "unverified";
  if($line = mysql_fetch_array($result, MYSQL_ASSOC)) {
    if ($line["verified"] == "1") {
      $json["status"] = "verified";
    }
  }

  mysql_close();

  header('Content-type: application/json');
  echo(json_encode($json));
?>

## twiml.php
<?php
  require("Services/Twilio.php");
  require("database.php");

  $response = new Services_Twilio_Twiml();

  if (empty($_POST["Digits"])) {
    $gather = $response->gather(array('numDigits' => 6));
    $gather->say("Please enter your verification code.");
  }
  else {
    // grab db record and check for match
    $result = db(sprintf("select * from numbers where phone_number='%s'", $_POST["Called"]));
    if($line = mysql_fetch_array($result, MYSQL_ASSOC)) {
      if ($_POST["Digits"] === $line["verification_code"]) {
        db(sprintf("UPDATE numbers SET verified = 1 WHERE phone_number = '%s'", $_POST["Called"]));
        $response->say("Thank you! Your phone number has been verified.");
      }
      else {
        // if incorrect, prompt again
        $gather = $response->gather(array('numDigits' => 6));
        $gather->say("Verification code incorrect, please try again.");
      }
    }
    mysql_close();
  }

  print $response;
?>
	<?php
	require("Services/Twilio.php");
	require("database.php");

	// require POST request
	if ($_SERVER['REQUEST_METHOD'] != "POST") die;

	// generate "random" 6-digit verification code
	$code = rand(100000, 999999);

	// save verification code in DB with phone number
	// attempts to delete existing entries first
	$number = mysql_real_escape_string($_POST["phone_number"]);
	db(sprintf("DELETE FROM numbers WHERE phone_number='%s'", $number));
	db(sprintf("INSERT INTO numbers (phone_number, verification_code) VALUES('%s', %d)", $number, $code));

	mysql_close();

	// initiate phone call via Twilio REST API
	// Set our AccountSid and AuthToken
	$AccountSid = "ACxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
	$AuthToken = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";

	// Instantiate a new Twilio Rest Client
	$client = new Services_Twilio($AccountSid, $AuthToken);

	try {
	// make call
	$call = $client->account->calls->create(
	'+18881234567', // Verified Outgoing Caller ID or Twilio number
	$number, // The phone number you wish to dial
	'http://example.com/twiml.php' // The URL of twiml.php on your server
	);
	} catch (Exception $e) {
	echo 'Error starting phone call: ' . $e->getMessage();
	}

	// return verification code as JSON
	$json = array();
	$json["verification_code"] = $code;

	header('Content-type: application/json');
	echo(json_encode($json));
	?>
	<?php
	$db_host='localhost';
	$db_name='dbname';
	$db_user='dbuser';
	$db_passwd='dbpassword';

	mysql_connect($db_host, $db_user, $db_passwd)
	or die('Could not connect: ' . mysql_error());

	mysql_select_db($db_name) or die('Could not select database');

	function db($sql)
	{
	$result = mysql_query($sql) or die('Query failed: ' . mysql_error());
	return $result;
	}
	?>
	--
	-- Table structure for table `numbers`
	--

	CREATE TABLE IF NOT EXISTS `numbers` (
	`id` int(11) NOT NULL AUTO_INCREMENT,
	`phone_number` varchar(50) DEFAULT NULL,
	`verification_code` int(11) DEFAULT NULL,
	`verified` tinyint(1) NOT NULL,
	PRIMARY KEY (`id`)
	) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;
	<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
	<html>
	<head>
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
	<title>Phone Verification by Twilio</title>
	<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
	<script type="text/javascript">
	$(document).ready(function(){
	$("#enter_number").submit(function(e) {
	e.preventDefault();
	initiateCall();
	});
	});

	function initiateCall() {
	$.post("call.php", { phone_number : $("#phone_number").val() },
	function(data) { showCodeForm(data.verification_code); }, "json");
	checkStatus();
	}

	function showCodeForm(code) {
	$("#verification_code").text(code);
	$("#verify_code").fadeIn();
	$("#enter_number").fadeOut();
	}

	function checkStatus() {
	$.post("status.php", { phone_number : $("#phone_number").val() },
	function(data) { updateStatus(data.status); }, "json");
	}

	function updateStatus(current) {
	if (current === "unverified") {
	$("#status").append(".");
	setTimeout(checkStatus, 3000);
	}
	else {
	success();
	}
	}

	function success() {
	$("#status").text("Verified!");
	}
	</script>
	</head>
	<body>
	<form id="enter_number">
	<p>Enter your phone number:</p>
	<p><input type="text" name="phone_number" id="phone_number" /></p>
	<p><input type="submit" name="submit" value="Verify" /></p>
	</form>

	<div id="verify_code" style="display: none;">
	<p>Calling you now.</p>
	<p>When prompted, enter the verification code:</p>
	<h1 id="verification_code"></h1>
	<p><strong id="status">Waiting...</strong></p>
	</div>
	</body>
	</html>