How can I Access Variable outside a file?

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PHP

Hi
I am very new to php..I need your help

I have to files: A,B
in A:

class A
public $var;
//
function...{
static $var=0; (as I want to change and keep the value)
if.... $var+=1;

}

?>
in other file I have Class B

Class B
//
function...{
include(A.class.php)
$var2=new A
if $var2->var1==0  .....

But the problem is it always return null...I want the last value in class A...But that doesnt work....Please help me on this
I cant figure it out!!!


Regards