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Domain-Driven Design in PHP

Domain-Driven Design in PHP

By : Keyvan Akbary, Carlos Buenosvinos, Christian Soronellas
4.3 (9)
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Domain-Driven Design in PHP

Domain-Driven Design in PHP

4.3 (9)
By: Keyvan Akbary, Carlos Buenosvinos, Christian Soronellas

Overview of this book

Domain-Driven Design (DDD) has arrived in the PHP community, but for all the talk, there is very little real code. Without being in a training session and with no PHP real examples, learning DDD can be challenging. This book changes all that. It details how to implement tactical DDD patterns and gives full examples of topics such as integrating Bounded Contexts with REST, and DDD messaging strategies. In this book, the authors show you, with tons of details and examples, how to properly design Entities, Value Objects, Services, Domain Events, Aggregates, Factories, Repositories, Services, and Application Services with PHP. They show how to apply Hexagonal Architecture within your application whether you use an open source framework or your own.
Table of Contents (16 chapters)
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14
Bibliography
15
The End

The Good Old Days


Before the release of PHP 4, the language didn't embrace the Object-Oriented paradigm. Back then, the usual way of writing applications was by using procedures and global state. Concepts like Separation of Concerns (SoC) and Model-View-Controller (MVC) were alien among the PHP community. The example below is an application written in this traditional way, where applications were composed of many front controllers mixed with HTML code. During this time, Infrastructure-, Presentation-, UI-, and Domain-layer code were all tangled together:

include __DIR__ . '/bootstrap.php';

$link = mysql_connect('localhost', 'a_username', '4_p4ssw0rd');

if (!$link) {
    die('Could not connect: ' . mysql_error());
}

mysql_set_charset('utf8', $link);
mysql_select_db('my_database', $link);

$errormsg = null ;
if (isset($_POST['submit'] && isValid($_POST['post'])) {
    $post = getFrom($_POST['post']);
    mysql_query('START TRANSACTION', $link);
    $sql = sprintf(
        "INSERT...
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