Conventions used

There are a number of text conventions used throughout this book.

Code in text: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "This chapter also taught you how the new Attribute class can be used as an eventual replacement for PHP DocBlocks."

A block of code is set as follows:

// /repo/ch01/php7_prop_reduce.php
declare(strict_types=1);
class Test {
 protected $id = 0;
 protected $token = 0;
 protected $name = '';o

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

$result = match(<EXPRESSION>) {
    <ITEM> => <EXPRESSION>,
   [<ITEM> => <EXPRESSION>,]
    default => <DEFAULT EXPRESSION>
};

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

Fatal error: Uncaught TypeError: Cannot assign string to property Test::$token of type int in /repo/ch01/php8_prop_danger.php:12

Tips or important notes

Appear like this.