hi

[abalfazl]

class Animal
{
      // This is the base animal class, which Cat and Dog derive from
        
        var $name;

        function setName($name)
        {
                $this->name = $name;
        }

        function makeSound()
        {
                echo "...\n";
        }
}

class Cat extends Animal
{
        // Cat inherits $name, setName() and makeSound() from Animal.
        function makeSound()
        {
                // Here we override makeSound()
                echo "Meow!\n";
        }
}

class Dog extends Animal
{
        function makeSound()
        {
                echo "Woof!\n";
        }
}

class Squirrel extends Animal
{
        // Since we don't define anything here, Squirrel will just 
inherit everything from Animal and leave it at that
}

$a = new Animal;
$c = new Cat;
$d = new Dog;
$s = new Squirrel;

$a->makeSound(); // Outputs "..."
$c->makeSound(); // Outputs "Meow!"
$d->makeSound(); // Outputs "Woof!"
$s->makeSound(); // Outputs "..."

$animals = array($c, $s, $d, $a);
foreach($animals as $animal)
{
        $animal->makeSound(); // Outputs "Meow!", "...", "Woof!" and 
"..."
} 

[guido2004]

Hi.



Do you have a question?

[Cups]

Next step is to make sure Animal cannot be called, only implemented. Someone already converted the Head First Design Pattern example of a Strategy Pattern (featuring animals, btw) to PHP, it may expand your horizon.