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    <p>Dependency injection is a big word for "I have some more parameters in my constructor".</p> <p>It's what you did before the awfull Singleton wave when you did not like globals :</p> <pre><code>&lt;?php class User { private $_db; function __construct($db) { $this-&gt;_db = $db; } } $db = new Db(); $user = new User($db); </code></pre> <p>Now, the trick is to use a single class to manage your dependencies, something like that :</p> <pre><code>class DependencyContainer { private _instances = array(); private _params = array(); public function __construct($params) { $this-&gt;_params = $params; } public function getDb() { if (empty($this-&gt;_instances['db']) || !is_a($this-&gt;_instances['db'], 'PDO') ) { $this-&gt;_instances['db'] = new PDO( $this-&gt;_params['dsn'], $this-&gt;_params['dbUser'], $this-&gt;_params['dbPwd'] ); } return $this-&gt;_instances['db']; } } class User { private $_db; public function __construct(DependencyContainer $di) { $this-&gt;_db = $di-&gt;getDb(); } } $dependencies = new DependencyContainer($someParams); $user = new User($dependencies); </code></pre> <p>You must think you just another class and more complexity. But, your user class may need something to log messages like lot of other classes. Just add a getMessageHandler function to your dependency container, and some <code>$this-&gt;_messages = $di-&gt;getMessageHandler()</code> to your user class. Nothing to change in the rest of your code.</p> <p>You'll get lot of infos on <a href="http://components.symfony-project.org/dependency-injection/trunk/book/00-Introduction" rel="noreferrer">symfony's doc</a></p>
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    1. POHow can I use "Dependency Injection" in simple php functions, and should I bother?
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    1. COthank you for the easy-to-understand quick start PDO example, bundled in with your answer to the actual question :)
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      1. USAditya M P
    2. COI feel crazy for being the first person to see it, but is the first word in this (great response) not the right word?
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      1. USThilo Savage
    3. CO@ThiloSavage first one to mention it. Thanks.
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