In this book, you will find a number of styles of text 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: "Now run the following command to create a subdirectory called basic, and fill it with the basic application template."

A block of code is set as follows:

require_once(__DIR__ . '/../../vendor/yiisoft/yii2/Yii.php'),
new yiiwebApplication(
    require(__DIR__ . '/../../config/web.php')
);

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

require_once(__DIR__ . '/../../vendor/yiisoft/yii2/Yii.php'),
new yiiwebApplication(
    require(__DIR__ . '/../../config/web.php')
);

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

$ php composer.phar require --prefer-dist yiisoft/yii2-debug "*"

New terms and important words are shown in bold. Words that you see on the screen, in menus or dialog boxes for example, appear in the text like this: "You should fill the available fields as shown in the following table, and hit the Preview button."