Controller Method Name Prefix

i looked into this and there are many other frameworks that use the convention of underscores to denote private methods. for some it was required. its relatively recently that its been considered a "bad practice". I've gone back and forth but the one thing i really like about it is when calling a private method in a controller

PHP Code:

$this->_verifyUser($id); 

$this->verifyUser($id); 


in codeigniter, with the first one you know immediately you are calling a private method.