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copied!<p>This will be a simplification, but to give you a real life example:</p> <p>Consider that you were to create a content management system, i.e., a script to show different pages on your website based on user input.</p> <p>You would probably want each page (let's call them modules) to have specific features, such as allowable commands to be executed when on that page/module. These different commands could then be different methods within each module class.</p> <p>However, what if you were to allow a login command, no matter where the user was currently at in your website? i.e., this would be a command shared between all the modules. </p> <p>Your solution to this could then be solved by having a parent module class, where the login method would reside, and be executable by all the modules.</p> <pre><code>// Your parent class abstract class ParentModule { protected function login() { // Login stuff } } // One of your modules final class ArticleModule extends ParentModule { public function submit_article() { // An example function } } // Another one of your modules that the user could still login from final class AnotherModule extends ParentModule { public function another_command() { // Magic } } </code></pre> <p>Your controller could then look something like the below.</p> <pre><code>$module = new ArticleModule(); $module->login(); $module->submit_article(); </code></pre> <p>Lastly, when you get into looking at interfaces - took me forever to understand those - you will again see the benefit of abstract classes. And indeed, if you fully grasp the concept of abstract classes, you will more easily understand interfaces.</p>

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