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    <p>there are number of options how to resolve dependencies problem (object A requires object B):</p> <p>constructor injection</p> <pre><code> class Sms { function __construct($db) .... } $sms = new Sms (new MyDbClass); </code></pre> <p>setter injection</p> <pre><code> class Sms { protected $db; } $sms = new Sms; $sms-&gt;db = new MyDbClass; </code></pre> <p>'registry' pattern</p> <pre><code> class Registry { static function get_db() { return new MyDbClass; }} class Sms { function doSomething() { $db = Registry::get_db(); $db-&gt;.... }} </code></pre> <p>'service locator' pattern</p> <pre><code> class Loader { function get_db() { return new MyDbClass; }} class Sms { function __construct($loader) { $this-&gt;loader = $loader; function doSomething() { $db = $this-&gt;loader-&gt;get_db(); $db-&gt;.... }} $sms = new Sms(new Loader); </code></pre> <p>automated container-based dependency injection, see for example <a href="http://www.sitepoint.com/blogs/2009/05/11/bucket-is-a-minimal-dependency-injection-container-for-php" rel="nofollow noreferrer">http://www.sitepoint.com/blogs/2009/05/11/bucket-is-a-minimal-dependency-injection-container-for-php</a></p> <pre><code> interface DataSource {...} class MyDb implements DataSource {...} class Sms { function __construct(DataSource $ds) .... $di = new Dependecy_Container; $di-&gt;register('DataSource', 'MyDb'); $sms = $di-&gt;get('Sms'); </code></pre> <p>to name a few ;)</p> <p>also the Fowler's article i gave you before is really worth reading</p>
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    1. COdo you have a clue of processing times of each ? which is faster and which is slower? Or if there is not much difference then constructor thing looks simplest for me :)
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      1. USAtif Mohammed Ameenuddin
    2. COOoh, nice overview. Thanks :)
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    3. COYou and I understand the `Registry` and `ServiceLocator` patterns differently. To me, your Registry looks like a ServiceLocator (a Registry that knows how to instantiate objects) and your ServiceLocator looks like well... a ServiceLocator that's implemented into another class via composition. And nothing here looks like a Registry.
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      1. USPeter Bailey
 

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