I first had to add this functionality when adding my wife to reminders. It's worked well for me since, so here it is.
The complete source code for this recipe can be found in the
Let's add another person to our reminders. We're going to add the ability to add a second phone number to a reminder and have them get notified when you get notified.
Services/folder to your website.
sql.sqlto your database
config.phpto your website and make sure the following variables are set:
<?php session_start(); $accountsid = '';//YOUR TWILIO ACCOUNT SID ...