What is the best way to load global variables?

[eluser]behnampmdg3[/eluser]
Hello;

What is the best way to load constants? For example

Code:

define("MAXSIZE", 100);

Helper? Contoller? How?

Thanky thanky

[eluser]PhilTem[/eluser]
./application/config/constants.php

[eluser]behnampmdg3[/eluser]
[quote author="PhilTem" date="1357682897"]./application/config/constants.php[/quote]Thank you