create functions based on array values

Can you use the __call PHP class functionality?

http://www.php.net/manual/en/language.oop5.overloading.php#object.call

You could use __call in your class and call your function for grabbing the page types and check them against the $name (first) argument and running custom code against it.

For instance:

__call ($name, $args) {
    $types = array ('type_a', 'type_b', 'type_c');

    if (in_array($name, $types) {
        // custom code
    }
}

UPDATE: Response to gist.

So using __call as a method on your class, on line 90 of your gist, you would use:

$this->$slug();