Objects... erm.. within Objects..

Grofit

Hey there.... ive got a problem or 2.. i think...

heres an example of what i want to do:

//ClassA.php
class A
{
var $Int;

function Print()
{
echo $int;
}
}

//ClassB.php
include("ClassA.php");

class B
{
var $AObj;

function B()
{
$AObj = new A;
}
}

Right now i want to be able to make use of the functions within class A within class B but in another file.... although when i try:

//Script.php
include("ClassB.php");

$BObj = new B();
$BObj->$AObj->Print();

that kicks up an error... SO!

this throws up the question, how can you use objects within objects to still keep the functionality needed... i hope this isnt too confusing...

the ACTUAL problem i have involves like 2 classes within 1 container class , but i cant make use of functions or variables in the other objects contained.. which is my problem..

Anyone have any info on why it wont work or if there is a different way to do it?

laserlight

What's the error?

Grofit

Fatal error: Call to a member function on a non-object

so it seems to think its not an object where as it is...

Grofit

I originally wanted to derive a class from 2 classes... so like

Class A + Class B = Class C

but it kicked up a fuss and wouldnt let me derive C from A+B... is there specific way to do this? as it would make things ALOT easier if i could do that.. although im still puzzled on the answer to the original question... in PHP i belive you use extends when deriving opposed to public etc in C..

tsinka

Hi,

don't use reserverd words like print as function names. Additionally, you need to use $this to access member variables, something like this:

<?PHP
//ClassA.php
class A {
  var $val;

  function A($avar=0) {
    $this->val = $avar;
  }

  function printit() {
    echo $this->val;
  }
}

class B {
  var $AObj; 

  function B($val = 0) {
    $this->AObj = new A($val);
  }
}

$objB = new B(10);
$objB->AObj->printit();

?>

Thomas

Grofit

yes yes... sorry that was just a quick example.. my problems alot more complicated.. and its the line:

$objB->AObj->printit();

that kicks up the problem... everything else works fine...

tsinka

Which PHP version do you have ?

Grofit

Version 4 i belive,

i am using the PHPDEV4.2.3 kit as it saves me setting up Apache, mySQL, PHP seperatly...

Grofit

no solution in sight?

thanks for your help anyway 🙂

laserlight

There should be a way of doing what you want to do, though not in the way that you wish to do it.

tsinka

That could be a dereferencing problem:

Replace
$objB->AObj->printit();

$obj = $objB->AObj;
$obj->printit();

Thomas

Grofit

tried that tom... dont work.. ive also tried making a pointer to the object and some other methods... in the end i just re-wrote the class and derived it from 1 class..