/**

* php抽象類與抽象方法的例子

* edit: www.jbxue.com

*/

abstract class Animal{

function __construct($name='No-name', $breed='unknown', $price = 15) {

$this->name = $name;

$this->breed = $breed;

$this->price = $price;

}

function setName($name) {

$this->name = $name;

}

function setBreed($breed){

$this->breed = $breed;

}

function setPrice($price) {

$this->price = $price < 0 ? 0 : $price;

}

function getName() {

return $this->name;

}

function display() {

printf("

%s is a %s and costs \$%.2f.

\n", $this->name, $this->breed, $this->price);

}

public static $type = "animal";

public static function fly($direction = 'around') {

printf("

Flying %s.

\n", $direction);

}

abstract public function birdCall();

}

class Parrot extends Animal {

public function birdCall($singing=FALSE) {

$sound = $singing ? "twitter" : "chirp";

printf("

%s says: *%s*

\n", $this->getName(), $sound);

}

}

?>

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