Book Image

Learning PHP 7

By : Antonio L Zapata (GBP)
Book Image

Learning PHP 7

By: Antonio L Zapata (GBP)

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 with a host of new features, and it provides major backwards-compatibility breaks. This book begins with the fundamentals of PHP programming by covering the basic concepts such as variables, functions, class, and objects. You will set up PHP server on your machine and learn to read and write procedural PHP code. After getting an understanding of OOP as a paradigm, you will execute MySQL queries on your database. Moving on, you will find out how to use MVC to create applications from scratch and add tests. Then, you will build REST APIs and perform behavioral tests on your applications. By the end of the book, you will have the skills required to read and write files, debug, test, and work with MySQL.
Table of Contents (17 chapters)
Learning PHP 7
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
Index

Working with strings


Working with strings in real life is really easy. Actions like Check if this string contains this or Tell me how many times this character appears are very easy to perform. But when programming, strings are concatenations of characters that you cannot see at once when searching for something. Instead, you have to look one by one and keep track of what the content is. In this scenario, those really easy actions are not that easy any more.

Luckily for you, PHP brings a whole set of predefined functions that help you in interacting with strings. You can find the entire list of functions at http://php.net/manual/en/ref.strings.php, but we will only cover the ones that are used the most. Let's look at some examples:

<?php

$text = '   How can a clam cram in a clean cream can? ';

echo strlen($text); // 45
$text = trim($text);
echo $text; // How can a clam cram in a clean cream can?
echo strtoupper($text); // HOW CAN A CLAM CRAM IN A CLEAN CREAM CAN?
echo strtolower($text...