Book Image

Learning PHP 7 High Performance

Book Image

Learning PHP 7 High Performance

Overview of this book

PHP is a great language for building web applications. It is essentially a server-side scripting language that is also used for general-purpose programming. PHP 7 is the latest version, providing major backward-compatibility breaks and focusing on high performance and speed. This fast-paced introduction to PHP 7 will improve your productivity and coding skills. The concepts covered will allow you, as a PHP programmer, to improve the performance standards of your applications. We will introduce you to the new features in PHP 7 and then will run through the concepts of object-oriented programming (OOP) in PHP 7. Next, we will shed some light on how to improve your PHP 7 applications' performance and database performance. Through this book, you will be able to improve the performance of your programs using the various benchmarking tools discussed. At the end, the book discusses some best practices in PHP programming to help you improve the quality of your code.
Table of Contents (17 chapters)
Learning PHP 7 High Performance
Credits
About the Author
Acknowledgement
About the Reviewer
www.PacktPub.com
Preface
Index

HTTP persistent connection


In HTTP persistent connection, or HTTP keep-alive, a single TCP/IP connection is used for multiple requests or responses. It has a huge performance improvement over the normal connection as it uses only a single connection instead of opening and closing connections for each and every single request or response. Some of the benefits of the HTTP keep-alive are as follows:

  • The load on the CPU and memory is reduced because fewer TCP connections are opened at a time, and no new connections are opened for subsequent requests and responses as these TCP connections are used for them.

  • Reduces latency in subsequent requests after the TCP connection is established. When a TCP connection is to be established, a three-way handshake communication is made between a user and the HTTP server. After successfully handshaking, a TCP connection is established. In case of keep-alive, the handshaking is performed only once for the initial request to establish a TCP connection, and no handshaking...