Custom Validation Function

The easiest thing to do is to create that function in a helper, not a library. As long as the helper is loaded, it will be able to find the function just like it can find any PHP command.

A slightly more "proper" way to do it would be to extend the Form_validation library in a MY_Form_validation file. Add the functions to that, and then you should be able to use it like:

Code:

$this->form_validation->set_rules('input', 'lang:', 'trim|required|my_validation' );

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