Advanced PHP - part 2

We will learn about the access modifiers available to PHP classes. Like any other programming languge , we have public ( acessible to all ) , private ( acessible to methods inside the class ) and protected ( classes derived from it can access ..besides methods inside ).

<?php
   class Test {
      ////////////////////////////////////////
      // Private variables are only accessible to 
      // methods inside the class  
      private $d1; 
      ////////////////////////////////////////
      // Public variables are available for anyone 
      //   
      public $d2;  
      ////////////////////////////////////////
      // Protected variables are available to  
      // all the methods inside the class and 
      // and classes inherited from it..    
      protected $d3;  

      public function  Dump () {
          echo $this->d3;
          echo "\n";
          $this->d2=400;  
          echo $this->d2;
          echo "\n";
          $this->d1=200; 
          echo $this->d1;  
      }  
      
   };

   ////////////////////////////////////
   //
   // Test2 inherits from Test..it can access
   // protected members of the base...   
   class Test2 extends Test
   {
         public function Set( $val ) {
               $this->d3 = $val;
         }
   };


   $test_inst = new Test2();
   $test_inst->Set(10);
   $test_inst->Dump(); 

   
?>

[sandhya@localhost newoop]$ php -f second2.cpp
10
400
200[sandhya@localhost newoop]$