Manual de PHP
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Object Abstraction

PHP 5 introduces abstract classes and methods. An abstract method only declares the method's signature and does not provide an implementation. A class that contains abstract methods needs to be declared abstract.

Ejemplo 14-4.

<?php
abstract class AbstractClass {
   abstract public function test();
}

class ImplementedClass extends AbstractClass {
   public function test() {
       echo "ImplementedClass::test() called.\n";
   }
}

$o = new ImplementedClass;
$o->test();
?>

Abstract classes cannot be instantiated. Old code that has no user-defined classes or functions named 'abstract' should run without modifications.

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Object Interfaces