Introduction to PHP5 interface and PHP5 abstract class syntax

ForThe code for the specific PHP5 abstract class is as follows:

 
 

  
  
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 interface concept and introduces the interface and implements keywords for it. Like Java, PHP 5 uses interfaces to achieve the same effect as "Multi-inheritance. The PHP5 interface syntax is as follows:

 
 

  
  
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 PHP5 interfaces makes PHP a fully object-oriented language.