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copied!<p><strong>You are doing it wrong <sup>tm</sup></strong></p> <ol> <li><p>You should be utilizing an autoloader, instead of including files with each class manually. You should learn about <a href="http://php.net/manual/en/function.spl-autoload-register.php" rel="noreferrer"><code>spl_autoload_register()</code></a> and and <a href="http://php.net/manual/en/language.namespaces.php" rel="noreferrer">namespaces</a>, and how to utilize both of them.</p></li> <li><p>Do not generate output in the <code>__construct()</code> methods. That's an extremely bad practice</p></li> <li><p>The variables are still there. That is not the problem. In PHP, when you extend a <strong>class</strong>, it <strong>does not inherit the constructor</strong>. </p></li> <li><p>You do not understand how inheritance works. When you call method on instance of extended class <strong>it will not execute parent class's method , before calling extended class's methods</strong>. They get overwritten , not stacked.</p></li> <li><p>Object variables should not be exposed. You are breaking the encapsulation. Instead og defining them as <code>public</code> you should use <code>protected</code>.</p></li> <li><p>You should extend classes of they are different type same general thing. The <code>extends</code> in PHP means <strong>is-a</strong>. Which means that, when you write <code>class Oak extends Tree</code>, you mean that all the oaks are trees. The same rule would mean, that in your understanding all <code>Property</code> instances are just a special case of <code>Core</code> instances. Which they clearly ain't.</p> <p>In OOP, we have principle. One of which is <a href="http://en.wikipedia.org/wiki/Liskov_substitution_principle" rel="noreferrer">Liskov substitution principle</a> (shorter <a href="http://www.globalnerdy.com/wordpress/wp-content/uploads/2009/07/liskov_substitution_principle_small.jpg" rel="noreferrer">explanation</a>). And this is the thing your classes are violating.</p></li> </ol>

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