PHP library for working with Twitter’s OAuth API.
https://github.com/abraham/twitteroauth
Authenticating a Twitter Feed for OAuth API V1.1 – Timelines & streams
This tutorial is designed to help anyone who is using or wants to create a custom Twitter feed that needs to authenticate basic read-only access for any public user timeline with Twitter OAuth, API V1.1.
http://www.webdevdoor.com/php/authenticating-twitter-feed-timeline-oauth/