Abstract Classes

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.

abstract class ab {
    abstract public function test();

/* the implementing class must implement all methods
 * specified in the abstract class */
class imp_ab extends ab {
    public function test() { 
        echo "implemented class was called";

$a = new imp_ab();


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