PHP Autoload
function myAutoloadFunction($classname) {
if (preg_match('/^[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*$/', $classname)) {
//check for valid classname
require_once "/path/to/classes/$classname.php";
}
}
spl_autoload_register('myAutoloadFunction');