Conventions

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: "Every time we write an Observable, we'll extend the base Rx\Observable class."

A block of code is set as follows:

Rx\Observable::just('{"value":42}')
    ->lift(function() {
        return new JSONDecodeOperator();
    })
    ->subscribe(new DebugSubject());

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

use Rx\Observable\IntervalObservable;
class RedditCommand extends Command {
  /** @var \Rx\Subject\Subject */
  private $subject;
  private $interval;

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

$ sleep.php proc1 3

proc1: 1

proc1: 2

proc1: 3

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: "PHP has to be compiled with the Thread Safety option enabled."

Note

Warnings or important notes appear in a box like this.

Tip

Tips and tricks appear like this.