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TABLE OF CONTENTS

An Essential Beginners Guide to Learn
the Realms of PHP From A-Z

PHP

An Essential Beginners Guide
to Learn the Realms of PHP
From A-Z

Logan Pratt

Introduction

PHP is considered one of the most popular development languages and web applications. It was created in order to make dynamic Web pages; however, over the years of its existence, the PHP language turned into something much more useful. Thanks to PHP development people can easily create complex applications, such as forums, photo galleries and much more.

This book will introduce you to the process of writing code and developing on PHP language. It will lead along the way from creating a simple web page with content before building interactive web applications.

We will touch upon security issues, interaction with the database, and creating a development environment for your PHP applications. As you read the book, you will be working on a small but reliable blog application to apply theoretical knowledge, obtained in each chapter, to the real development process.

Before starting a merciless fight, it is good practice to get informed and to prepare. As probably said by a very great man whose name I do not know and whose existence I cannot prove, "half the battle is played during its preparation." On the menu of the day, you will find a short introduction to the basics of PHP and especially on the overall operation of it. Everything will be complemented with a few lines on what is programming, and as for dessert, I will let you discover it.

Chapter One

The Basics Of PHP

Before embarking on scripts, you have to start at the beginning: the syntax of PHP.

This part is essential; if you do not know the basics of language at the fingertips, you will lose a lot of time later.

PHP, The Web, What Is It?

PHP, for PHP: Hypertext Preprocessor, is a programming language. There are many others, like C, Java, OCaml, but we can say that PHP is a programming language oriented for the Web or for websites.

For the record, PHP was born at the hand of RasmusLerdorf in 1994. At first very basic, it was made public in 1995 under the name of PHP / FI. Subsequently, the development passed from the hands of RasmusLerdorf to those of two students - ZeevSuraski and Andi Gutmans - who later founded Zend Technologies to promote PHP. If you develop applications with PHP, you will undoubtedly hear about Zend, whether through their framework, their development environment, or their server, respectively Zend Framework, Zend Studio, and Zend Server.

Not content to be a programming language, PHP is an interpreted language. When you use an application, under Windows, for example, you double-click on the program to launch it; the program then runs, your computer can directly run the program. For PHP, it's a little different. Indeed, your computer does not understand PHP; it does not know how to run it, for PHP to be executed, the file containing the PHP code must be interpreted by ... the PHP interpreter.

In concrete terms, what is the interpreter? As I said, your computer can not run PHP code as it runs a classic application. For your code to come alive, the interpreter - which is an executable application - will read it, translate it into an intermediate dialect - the Opcode - and finally ask your computer to execute the instructions corresponding to the generated Opcode. You will hear again about Opcode in the rest of this book, so do not stop there for the moment, just know it exists.

The Web - How Does It Work?

First of all, what is the Web? The Web - or World Wide Web - is the system that allows you to read this content, which allows you to access content, pages of a site, usually accessible via the internet. The Web is often confused with the Internet, but the Internet is definitely not on the Web: many other systems, applications, and protocols use the Internet. It is quite sad that some entities - companies, for example - rely on this confusion to make more attractive offers; by hammering us with slogans similar to "unlimited Internet" when, in fact, they offer us only access to the web, and still, not always very "unlimited" ... But I go astray; this is not the subject.

The web works on a model in which there are two speakers: the client and the server. You can perfectly make a comparison with a restaurant, it is quite relevant, and it gives good taste. When you are in a restaurant, sitting quietly, you choose a dish, whistle the waiter and tell him what you want. Once the client's request is received, the server will do its internal cooking to deliver what you ordered finally. So there are two messages, first a request from the client to the server, then a response from the server to the client. For a website, it's the same. Your browser - it acts as a client - will send a request to a server - and more exactly a web server - that will respond after processing.

The Web Server and PHP Interpreter - A Love Story?

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