... I send out a list of most interesting libraries and apps in the "PHP" section to about 1100 subscribers.
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Instagram's private API
PHP library for the Stripe API.
The Facebook SDK for PHP provides a native interface to the Graph API and Facebook Login. https://developers.facebook.com/docs/php
Instagram PHP Scraper. Get account information, photos, videos, stories and comments.
Super-simple, minimum abstraction MailChimp API v3 wrapper, in PHP
Send data to Google Analytics from the server using PHP. Implements GA measurement protocol.
Mailgun's Official SDK for PHP
An easy-to-use and simple Instagram package
The simplest PHP Wrapper for Twitter API v1.1 calls