Calling a user function within a user function

[JonnyReeves]

Simple question, best described with code....

<?php
function steve ($input, 'message');
   echo $message . $input;
}

function dave ($var1) {
   $steve = bob ($var1, 'hello');
   return $steve
}
?>

This is all made up for this example, but basically, 'bob' is another function which is being called from within the function 'dave' and obviously, when I try to run this I get the old "call to undefined function" error.

How do I get around this one?

Thanks
jonny.