classes : using class a from class b

[robtbs]

Hi,
i wanted to use classes to run my session functions and databases functions on my website.

Can i use
database from within the session class?

class database
{
  query()
  {
     //query code
  }

}

class session
{

  function dosomething()
  {
    $database->query();
  }

}

$database = new database;
$session = new session;

//do i have to do....
class session extends database
{


}

can i do that? it doesnt seem to work
Thanks

[bradgrafelman]

That's because $database is not in the local scope of the dosomething() function. You could fix this by simply adding global $database inside of the function. Or, you could modify your code like so:

class database { 
  function query() { 
     echo 'Hello world';
  }
} 

class session { 
  function dosomething() { 
	database::query();
  } 
} 

$session = new session;
$session->dosomething(); // Hello world