In this book, you will find a number of text styles that distinguish between different kinds of information. Here are some examples of these styles and an explanation of their meaning.

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "Objects might utilize the PHP Serializable interface, __sleep() or __wakeup() magic methods."

A block of code is set as follows:

interface RequestInterface extends MessageInterface
{
  public function getRequestTarget();
  public function withRequestTarget($requestTarget);
}

Any command-line input or output is written as follows:

php index.php
serverless invoke local --function hello

New terms and important words are shown in bold. Words that you see on the screen, for example, in menus or dialog boxes, appear in the text like this: "We start by clicking the New Project button under the Iron.io dashboard."