PHP is a server-side scripting language designed for web development but also used as a general-purpose programming language.
It was originally created by Rasmus Lerdorf in 1994, the PHP reference implementation is now produced by The PHP Group.
PHP originally stood for Personal Home Page, but it now stands for the recursive acronym PHP: HypertextPreprocessor.

1.Design Patterns PHP

This repository is created by Domnikl.
I like this repository because of the sample code of different design patterns and how developers could implement these patterns in PHP projects.
Every pattern has a small list of examples (most from Zend Framework, Symfony 2 and Doctrine 2).

2.Faker

Created by Fzaninotto, Faker is a PHP library that generates fake data for your projects.
Whether you need to bootstrap a database, create good-looking XML documents, fill-in the persistence for stress testing or anonymize data taken from a production service, Faker is the best tool for the job.

3.PHPMailer

Created by team PHPMailer, this is a full featured email sending class for PHP projects.
This class is a great replacement for the mail() function provided by PHP.

4.Monica

Created by Monicahq, Monica is a great app for keeping track of activities of friends and family members.
Through this simple app, developers could create custom projects that implement action tracking of specific profiles.

5.Platform-Agnostic Security Tokens

Created by paragonie-security, PAST is a specification and reference implementation for secure stateless tokens.

6.PHP MI

Created by Arkadiusz Kondas, this machine learning library offers a fresh approach to PHP based machine learning projects.
The library offers a whole host of options including association rule learning, regression, cross-validation and pre-processing.

7.Flysystem

Created by ThePHPLeague, Flysystem is a filesystem abstraction.
Use this library to replace the local file system with a remote file system.

8.Bootstrap CMS

This library offers a PHP based CMS that uses Laravel 5.1 and Sentry.
It is maintained by Graham Campbell.

9.Voten

Created by Voten, thi library offers a code for creating a realtime social bookmarking platform that is simple to use and offer great flexibility to the developers.

10.PsySH

Created by Bobthecow, PsySH offers a dev console and interactive debugger for PHP projects.
In effect, this repo creates a REPL platform for PHP developers.