Moving CI from php4 to php5

[eluser]pifantastic[/eluser]
This problem isn't just for loading views either. Here and there I find code in a view referencing a controller method like:

Code:

<?php
if ($this->logged_in()) {
echo '<h1>welcome!</h1>';
}
?&gt;

When this happens, I get an error like:

Fatal error: Call to undefined method CI_Loader::logged_in() in /blah/system/application/views/my_account/login_step.php on line 3