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...