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POPuzzled with Dependency Injection in PHP (chains of Classes)
 

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  1. POPuzzled with Dependency Injection in PHP (chains of Classes)
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    <p>I'm moving from Globals and Singletons (=bad?) to Dependency Injections (=good?) in PHP and I'm very new to it. </p> <p>I have read many related topics on Stack Overflow already but I still can't understand the main principles of DI.</p> <p>Please tell me if I'm doing it right (it's just shortened pseudo-code):</p> <pre><code>// first connect to DB $sql = new Sql(); // create logger (I'm writing logs to Database so I need to pass $sql to it) $log = new Log($sql); // restore logged in user, get info about user, unread messages... // class "User" needs access to Database and Logs: $user = new User($sql, $log); // now we need to collect all the data of current section of my Website // I'm using Model and Controller: $model = new FrontPageModel($sql, $user, $log); $pageController = new FrontPageController($model); </code></pre> <p>Though it may look OK at this step but what if I need to get access to more classes like Config, Session, etc.?</p> <p>Should my code transform to this?</p> <pre><code>$model = new FrontPageModel($sql, $user, $log, $config, $session); </code></pre> <p>Isn't it too much already?</p> <p>I know someone could advice to use a kind of big "Application" class and put Config, Session, Log, Db objects inside of this class but I feel that it isn't very good idea.</p> <p>Next question - what if I need to get logged User's ID inside of my FrontPageController? I did not pass an instance of "User" to FrontPageController, but it was passed before (in chain) to FronPageModel.</p> <pre><code>class FrontPageController{ private $model; function __construct($model){ $this-&gt;model = $model; } function getData(){ echo $this-&gt;model-&gt;user-&gt;id; // is it right way? } } </code></pre> <p>That "$this->model->user->id" seems like overkill to me.</p>
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    1. CORelated: http://stackoverflow.com/questions/4603555/how-to-deal-with-constructor-over-injection-in-net/4603666#4603666
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