access parent class variable

[maddogandnoriko]

I am fairly new to oop and am creating a class to extend a class. How do I use a parent classes variable? here is a basic structure I have.

 

class html_grabber{

  var html;

 

  SOME FUNCTIONS....

}

 

class link_checker{

var links;

 

function get_links(){

 

...pull links from parent's $html

 

 

}

 

I hope that is enough info....

Thank you,

                todd

 

 

[maddogandnoriko]

I wanted to clarify a little. I tried parent:html and $this->html. Both seemed not to work.

 

todd

[JonnoTheDev]

A class needs to be extended in order for the subclass to access its properties / methods as long as the properties / methods access levels allow it (public, private, protected)

 

class a {
  public $x;
}

class b extends a {
  public function setVal($y) {
     $this->x = $y;
  }
}

$obj = new b();
$obj->setVal(123);
print $obj->x;

[dgoosens]

you should post your complete class...

I can't see what you're trying to get done...

 

by the way, it would be parent::$html

(with two semi-colons)

[maddogandnoriko]

Ok....this is a very newbie question. How does the extended class know what instance of the parent class to get the variable from?

 

 

 

[JonnoTheDev]

Ok....this is a very newbie question. How does the extended class know what instance of the parent class to get the variable from?

 

The extended / parent class are of the same object. When extending a class you must use the keyword 'extends'

 

class a

class b extends a

 

When instantiating b I have all of the properties / methods of class a available to me as b is an extension of a.

 

Read some tutorials on extending classes