[PHP] OOP Class Interaction

[Jonathan Pitcher]

I have been writing OOP programs for the past couple years.  Over these 
years I have run into the same problem, I have solved the problem in 
many different ways.  I was wondering if there is a recommended way to 
solve the problem I have listed below.

To keep it simple, lets say I have 3 classes.  A main class, an error 
class and a log class.

The classes are laid out as:

              MAIN
                  |
      ----------------
      |                    |
ERROR          LOG
Now I want error to write a message to the log file.

Solution 1

      Store the Main class in a Session variable. And the access the 
Log through main.

     $_SESSION["Main"]->Log->Write_Error("My Error");

Solution 2

     Almost the same as above.  I store main in a Session Variable but 
the I create a global function to access log.

      function Write_Error($Message)
      {
             $_SESSION["Main"]->Log->Write_Error($Message);
     }
	This ways saves coding time because I don't have to write out the long 
session reference.

I know there are more ways to do this.  But every way I can think of 
requires you to store the main class in a session variable to access 
log.  Is there a way to access a parent class or a parents parent 
without doing what I did above ?

Thanks in advance,

Jonathan Pitcher