Conventions

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, and user input are shown as follows: "The NativeQuery class allows you to execute native SQL queries and to get their results as Doctrine entities."

A block of code is set as follows:

    /**
     * Adds comment
     *
     * @param  Comment $comment
     * @return Post
     */
    public function addComment(Comment $comment)
    {
        $this->comments[] = $comment;
        $comment->setPost($this);

        return $this;
    }

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

    /**
     * Adds comment
     *
     * @param  Comment $comment
     * @return Post
     */
    public function addComment(Comment $comment)
    {
        $this->comments[] = $comment;
 $comment->setPost($this);

        return $this;
    }

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

# php bin/load-fixtures.php

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: "The following text must be printed in the terminal: ATTENTION: This operation should not be executed in a production environment."