Quick __autoload() question

[KevinM1]

I've read that a lot of people use the __autoload() function to dynamically include whatever class files are needed.  I'm just wondering if I'm understanding how that's done:

You put your defined __autoload() function inside of a file that's included in every other page (like a config file), right?  And the definition would be something along the lines of the following code, correct?
[code]
<?php

function __autoload($className){
  include ("../classes/{$className}.php");
}

?>
[/code]

[Daniel0]

Yeah. But you need PHP5.