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

Optimizing the interpreter by adding a compiler


Our parser now works as it should, and you could use it in any kind of application to offer very flexible customization options to the end user. However, the parser does not work very efficiently. In general, parsing expressions are computationally expensive, and in most use cases, it is reasonable to assume that the actual expressions that you're working with do not change with every request (or at least, are evaluated more often than they are changed).

Because of this, we can optimize the parser's performance by adding a caching layer to our interpreter. Of course, we cannot cache the actual evaluation results of an expression; after all, these could change when they are interpreted with different variables.

What we're going to do in this section is add a compiler feature to our parser. For each parsed expression, our parser generates an AST that represents the structure of this expression. You can now use this syntax tree to translate the...