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.
Exemplu 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();
?>
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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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