Twilio Cookbook（Second Edition）
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Letting users subscribe to receive surveys

Before we can send surveys, we want to have a way for users to subscribe to them.

This form will let users enter their phone numbers and add them to the survey system.

You can put this page on a section of your website and allow people to sign up to receive your surveys.

Getting ready

The complete source code for this recipe can be found in the Chapter3/ folder of the code bundle available at http://www.packtpub.com/support.

How to do it...

Let's build a handy system to let users subscribe to receive our surveys. Perform the following steps:

  1. Load the sql.sql file into your database.
  2. Upload config.php to your website and make sure the following variables are set: 
    <?php
$accountsid = '';  //  YOUR TWILIO ACCOUNT SID
$authtoken = '';   //  YOUR TWILIO AUTH TOKEN
$fromNumber = '';  //  PHONE NUMBER CALLS WILL COME FROM

$dbhost = '';  //  YOUR DATABASE HOST
$dbname = '';  //  YOUR DATABASE NAME
$dbuser = '';  //  YOUR DATABASE USER
$dbpass = '';  //  YOUR DATABASE PASS
?>
  3. Upload pdo.class.php to your website.
  4. Upload a file on your web server called subscribe.php, with the following content: 
    <?php
include("config.php");
include("pdo.class.php");
include 'Services/Twilio.php';

$action = isset($_GET['action']) ? $_GET['action'] : null;
switch($action){
  case 'save':
    $fields = array('phone_number','status');
    $pfields = array();
    $_POST['status'] = 1;
    foreach( $fields as $k){
      $v = $_POST[$k];
      $pfields[] = "{$k} = '{$v}'";
    }
    $sql = "INSERT INTO subscribers SET ".implode(",",$pfields);
    $pdo = Db::singleton();
    $pdo->exec($sql);
    $qid = $pdo->lastInsertId();
    if( isset($qid) && !empty($qid) ){
?>
      <p>Thank you, you have been subscribed to receive surveys</p>
<?php
    }
  default:
?>
    <h2>Subscribe to receive surveys</h2>
    <form method="POST" action="subscribe.php?action=save">
    <table>
    <tr>
      <td>Please enter your phone number</td>
      <td><input type="text" name="phone_number" /></td>
    </tr>
    </table>
    <button type="submit">Save</button>
    </form>
<?php
    break;
}
?>

How it works...

In step 1, we set up our database; in step 2, we configured the settings.

In step 4, we uploaded subscribe.php. The subscribe.php file gives users a form where they enter their phone number and get added to the survey. This can work inside a Sales page on your website, where you want people to subscribe to your surveys.

I prefer letting users subscribe for surveys themselves rather than manually adding users to surveys, as it lets us get a better grasp on the system. When we give a subscriber some sort of incentive to sign up for a survey, they are more likely to reply to the surveys we send them. For example, we could use this as a contest, where each subscriber is entered into a draw for a prize, but only if they reply to our surveys.

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