Book Image

PHP 7 Programming Cookbook

By : Doug Bierer
Book Image

PHP 7 Programming Cookbook

By: Doug Bierer

Overview of this book

PHP 7 comes with a myriad of new features and great tools to optimize your code and make your code perform faster than in previous versions. Most importantly, it allows you to maintain high traffic on your websites with low-cost hardware and servers through a multithreading web server. This book demonstrates intermediate to advanced PHP techniques with a focus on PHP 7. Each recipe is designed to solve practical, real-world problems faced by PHP developers like yourself every day. We also cover new ways of writing PHP code made possible only in version 7. In addition, we discuss backward-compatibility breaks and give you plenty of guidance on when and where PHP 5 code needs to be changed to produce the correct results when running under PHP 7. This book also incorporates the latest PHP 7.x features. By the end of the book, you will be equipped with the tools and skills required to deliver efficient applications for your websites and enterprises.
Table of Contents (22 chapters)
PHP 7 Programming Cookbook
Credits
Foreword
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Validating $_POST data


The primary difference between filtering and validation is that the latter does not alter the original data. Another difference is in intent. The purpose of validation is to confirm that the data matches certain criteria established according to the needs of your customer.

How to do it...

  1. The basic validation mechanism we will present here is identical to that shown in the preceding recipe. As with filtering, it is vital to have an idea of the nature of the data to be validated, how it fits your customer's requirements, and also whether it matches the criteria enforced by the database. For example, if in the database, the maximum width of the column is 128, the validation callback could use strlen() to confirm that the length of the data submitted is less than or equal to 128 characters. Likewise, you could use ctype_alnum() to confirm that the data only contains letters and numbers, as appropriate.

  2. Another consideration for validation is to present an appropriate validation...