Book Image

Mastering PHP 7

By : Branko Ajzele
Book Image

Mastering PHP 7

By: Branko Ajzele

Overview of this book

PHP is a server-side scripting language that is widely used for web development. With this book, you will get a deep understanding of the advanced programming concepts in PHP and how to apply it practically The book starts by unveiling the new features of PHP 7 and walks you through several important standards set by PHP Framework Interop Group (PHP-FIG). You’ll see, in detail, the working of all magic methods, and the importance of effective PHP OOP concepts, which will enable you to write effective PHP code. You will find out how to implement design patterns and resolve dependencies to make your code base more elegant and readable. You will also build web services alongside microservices architecture, interact with databases, and work around third-party packages to enrich applications. This book delves into the details of PHP performance optimization. You will learn about serverless architecture and the reactive programming paradigm that found its way in the PHP ecosystem. The book also explores the best ways of testing your code, debugging, tracing, profiling, and deploying your PHP application. By the end of the book, you will be able to create readable, reliable, and robust applications in PHP to meet modern day requirements in the software industry.
Table of Contents (24 chapters)
Title Page
Credits
About the Author
About the Reviewers
www.PacktPub.com
Customer Feedback
Preface
16
Debugging, Tracing, and Profiling

Concurrency


While concurrency is a topic applicable to multiple layers of stack, there are a few configuration directives around web servers that every developer should be familiar with. Concurrency refers to handling multiple connections inside a web server. The two most popular web servers for PHP, Apache, and Nginx, both allow some basic configuration for handling multiple connections.

While there are plenty of debates as to which server is faster, Apache with the MPM event module is pretty much on par with the Nginx performance.

The following directives dictate the Apache MPM event concurrency, and are therefore worth keeping an eye on:

  • ThreadsPerChild: This is the number of threads created by each child process
  • ServerLimit: This is the limit on the configurable number of processes
  • MaxRequestWorkers: This is the maximum number of connections to be processed simultaneously
  • AsyncRequestWorkerFactor: This is the limit on concurrent connections per process

An absolute maximum numbers of possible...