Custom Validation Function

Hi guys,

Ive created a function(MyValidation) to validate the input format.

MyValidation function is I'm the same controller as my validation. I am able to run the validation by "callback_MyFunction". withOut any issue.

Now I'm trying to bring it out of my controller(Ive created a new class in library) that i can use this for another controllers without retype in new controller.

My validation to call MyValidation from library

PHP Code:

$this->form_validation->set_rules('input', 'lang:', 'trim|required|callback_'.$this->functions->MyValidation($this->input->post('input')) ); 


Also I've tried these 2 ways

PHP Code:

$this->form_validation->set_rules('input', 'lang:', 'trim|required|callback_'.$this->functions->MyValidation ); 


PHP Code:

$this->form_validation->set_rules('input', 'lang:', 'trim|required|callback_'.$this->functions->MyValidation() ); 


Any idea?