Abstract class and interface syntax for PHP 5

In PHP 5, abstract methods are marked with abstract keywords, and classes containing abstractions are abstract classes and must be marked with abstract.


? 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 also supports the concept of interfaces and introduces the interface and implements keywords. Like Java, PHP 5 uses interfaces to achieve a "multiple inheritance" effect. The syntax is as follows:


? PHP
Interface displayable {
function display ();
}
Interface Printable {
function Doprint ();
}

class Foo Implements displayable , Printable {
function display () {
// Code
  }    function Doprint () {
// Code
  }
}
?>
The introduction of abstract classes and interfaces makes PHP a fully object-oriented language. One more thing: this kind of syntax and Java is so much like.

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