This PHP Reference Guide is useful for beginners and advanced users of PHP. It provides a thorough list of links to PHP communities, articles, training guides, and much more.

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PHP Tutorials
W3Schools PHP – free online tutorials that takes you
step by step and makes it easy to learn for beginners.
TutorialsPoint PHP – a beginner and experienced PHP
resource that will get you started.
PHP Wiki – this reference has many links to different
PHP tutorials that are useful for beginners and experts.
Object-Oriented Programming With PHP – this
resource shows you all about object oriented
programming and how easy it is to get started.
Libraries & Frameworks
Assetic – an asset management framework for PHP. It
combines and minifies your CSS/JS assets.
Request – a library that makes it easy to issue HTTP
requests.
Validation – claims to be the most awesome validation
engine ever created in PHP.
Faker – a PHP library that generates fake data for you.
Omnipay – a payment processing library for PHP. It
has a clear and consistent API and supports dozens of
gateways. With this library, you only need to learn one
API and work with a variety of payment processors.
Developer Tools
Directus – a client-facing database GUI for managing
your project’s content.
Sublime Text – a sophisticated text editor for code,
markup, and prose.
PHP/CPP – a C++ library for developing PHP extensions.
Pattern Lab – a collection of tools to help you create
atomic design systems.
Communities
PHP Community – an active and vibrant community of
programmers that has grown up with an affinity for the
PHP language.
PHP DZone – this is where you can share what you’re
learning and even collaborate with other people.
Coding Forums – a great place to ask questions and
share your code with the community.
Stack Overflow – this is where you can ask specific code
related questions. Has a great community for a variety
of topics.
Code Tricks and Examples
W3Schools PHP – many different PHP examples
organized by categories.
PHP.net – the PHP website holds many code examples
that will be very useful.
CSS-Tricks – many different code snippets for you to
choose from.
Useful Articles
Useful PHP Functions and Features – a list of many
different features PHP programmers should know.
Advanced PHP Tips – a list of tips to help you along the
way.
Cheat Sheet
PHP Cheat Sheet – a reference to Java syntax, terms and
their definitions.
PHP Reference Guide