Book Image

PHP 7 Programming Blueprints

By : Jose Palala, Martin Helmich
Book Image

PHP 7 Programming Blueprints

By: Jose Palala, Martin Helmich

Overview of this book

When it comes to modern web development, performance is everything. The latest version of PHP has been improvised and updated to make it easier to build for performance, improved engine execution, better memory usage, and a new and extended set of tools. If you’re a web developer, what’s not to love? This guide will show you how to make full use of PHP 7 with a range of practical projects that will not only teach you the principles, but also show you how to put them into practice. It will push and extend your skills, helping you to become a more confident and fluent PHP developer. You’ll find out how to build a social newsletter service, a simple blog with a search capability using Elasticsearch, as well as a chat application. We’ll also show you how to create a RESTful web service, a database class to manage a shopping cart on an e-commerce site and how to build an asynchronous microservice architecture. With further guidance on using reactive extensions in PHP, we’re sure that you’ll find everything you need to take full advantage of PHP 7. So dive in now!
Table of Contents (15 chapters)
PHP 7 Programming Blueprints
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Preface
4
Build a Simple Blog with Search Capability using Elasticsearch

How interpreters and compilers work


Interpreters and compilers read programs that are formulated in a programming language. They either execute them directly (interpreters) or first convert them into a machine language or another programming language (compilers). Both interpreters and compilers usually have (among others) two components called lexer and parser.

This is a basic architecture of a compiler or interpreter

An interpreter may omit the code generation and run the parsed program directly without a dedicated compilation step.

The lexer (also called scanner or tokenizer) dissects an input program into its smallest possible parts, the so-called tokens. Each token consists of a token class (for example, numerical value or variable identifier) and the actual token contents. For example, a lexer for a calculator given the input string 2 + (3 * a) might generate the following list of tokens (each having a token class and value):

  1. Number ("2")

  2. Addition operator ("+")

  3. Opening bracket ("(")

  4. Number...