Ever wondered what an abstract class is? Well this little example should help you get started. Also check out the OOP tutorial at http://www.phpro.org/articles/Object-Oriented-Programming-with-PHP.php
<?php
// make sure it is broken
error_reporting(E_ALL);
abstract class media {
private $copyrightInfo;
abstract function play();
function setCopyrightInfo($info) {
$this->copyrightInfo = $info;
}
} // end of abstract class media
class cd extends media{
function play() {
echo "The CD has started playing!";
}
} // end class cd
$cd = new cd();
$cd->setCopyrightInfo("Copyrighted by who else? Me!");
$cd->play();
?>
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