<script>ec(2);</script>
PHP 5中用abstract关键字标明抽象方法，含有抽象方法的类是抽象类，也必须要用abstract标明。
php
abstract class AbstractClass {
abstract public function test();
}
class ImplementedClass extends AbstractClass {
public function test() {
echo "ImplementedClass::test() called. ";
}
}
$o = new ImplementedClass;
$o->test();
?> PHP 5也支持接口的概念，并为之引入了interface和implements关键字。和Java一样，PHP 5使用接口也实现类似于“多重继承”的效果。语法如下：
php
interface displayable {
function display();
}
interface printable {
function doprint();
}
class foo implements displayable,printable {
function display() {
// code
} function doprint() {
// code
}
}
?>抽象类和接口的引入使PHP成了一个完全面向对象的语言。多说一句：这样的语法和Java实在是太像了。
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