[PHP] Re: How to access one class from another

[Torsten Roehr]

"Brent Baisley" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> What is the best way to access one class from another? What I have is a
> couple of "core" classes that are loaded into instances at the start of
> each page. I then load instances of page specific classes. How would I
> access the already loaded instances of the core classes from inside one
> of the page specific classes?
>
> I tried a few things that didn't work. Is the only way to do this is to
> load another instance of the core classes?
> I'm finally trying to really get my hands around OOP, which has gone
> very smooth up until this instance:). I'm using v4 not v5.
>
> I'm looking for something like this:
> class Lists {
> function UserList() {
> }
> ...
> }
> $coreLists = new Lists();
> ...
> class Data {
> function Entry() {
> $users = $coreLists->UserList();  file://Accessing Lists Class
> ...
> }
> }

Hi Brent,

this is a case of variable scope:
http://de2.php.net/variables.scope

There are different ways to solve your problem:

1. Declare $coreLists global in your method:
   function Entry() {
      global $coreLists;
      $users = $coreLists->UserList();
   }

2. Access it via the superglobal $GLOBALS:
   function Entry() {
      $users = $GLOBALS['coreLists']->UserList();
   }

3. Pass the variable it to the class constructor and assign it to a class
property:
   var $coreLists;

   function Data($coreLists) {
      $this->coreLists = $coreLists;
   }

Best regards, Torsten Roehr

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