Differnet class vars

[glenelkins]

Hi

 

I must be getting boring on this forum now, i just keep coming accross new things i have'nt used in the past and just need some quick advice.

 

So in a class you have variables that can be used with the pointer $this. but what actually is the main difference between  a  "private" decleration, and a "protected"

[PFMaBiSmAd]

As always, the php.net documentation is the source of all the basic how to/what is php information -

Protected limits access to inherited and parent classes (and to the class that defines the item). Private limits visibility only to the class that defines the item.

[aschk]

Simple example...

 

<?php
class A {
  private $myprivate = "private";
  protected $myprotected = "protected";
}

class B extends A {
  public function getPrivate(){
    return $this->myprivate;
  }

  public function getProtected(){
    return $this->myprotected;
  }
}

$test = new B();
$test->getProtected();
$test->getPrivate();

?>

 

If you run the above code you will see that class B cannot use the private variable from the class it extended, however it CAN use the protected variable.

[glenelkins]

ok so then heres another one for you. can i make the __construct() function abstract?

[Ken2k7]

Yeah, if you really want to. For certain things like this, why not just write a sample script and test it yourself?

[glenelkins]

because im being lazy!

 

i do know after testing if i want to use __construct as abstract, i have to actually have to replace the constructor of the abstract class with the same name function like the old way

 

for example

 

Abstract class Test {

 

    function Test() {

 

      do constructor bits

 

    }

 

    Abstract function __construct();

}