The most popular PHP library for use with the Twitter OAuth REST API.
A lightweight and powerful OAuth 2.0 authorization and resource server library with support for all the core specification grants. This library will allow you to secure your API with OAuth and allow your applications users to approve apps that want to access their data from your API.
PHP Social Authentication Library
OAuth2 Server for PHP
Laravel wrapper around OAuth 1 & OAuth 2 libraries.
OAuth 2.0 Client Library
An OAuth 2.0 bridge for Laravel and Lumen
Support for authenticating users using both OAuth1.0a and OAuth2 in Symfony2.
Multi-provider authentication framework for PHP
PHP 5.3+ oAuth 1/2 Library
An OAuth library written in PHP by @themattharris
Symfony2 OAuth Server Bundle
OAuth Service Provider for Laravel 4
A PHP implementation of a SAML 2.0 service provider and identity provider, also compatible with Shibboleth 1.3 and 2.0.
Small and easy Twitter library for PHP
External authentication via OAuth and OpenID for the Yii framework
Light PHP wrapper for the OAuth 2.0 protocol (based on OAuth 2.0 Authorization Protocol draft-ietf-oauth-v2-15)
A simple way to integrate oauth and social sites like facebook, twitter and google into your Laravel 4 application.
EAuth extension allows to authenticate users by the OpenID, OAuth 1.0 and OAuth 2.0 providers.
A library to consume services using the OAuth 2 security scheme.
Opauth plugin for CakePHP v2.x, allowing simple plug-n-play 3rd-party authentication with CakePHP
Implements Graph API and some of the OAuth facilities to operate with Facebook
OAuth 1 PHP Library
Stupid simple OAuth authentication with Laravel and Eloquent