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[eluser]kiga[/eluser]
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Code:

// validation fields
    function _set_fields(){
        $fields['id'] = 'id';
        $fields['name'] = 'name';
        $fields['gender'] = 'gender';
        $fields['dob'] = 'dob';
        
        $this->validation->_set_fields($fields);
    }
// validation rules
    function _set_rules(){
        $rules['name'] = 'trim|required';
        $rules['gender'] = 'trim|required';
        $rules['dob'] = 'trim|required|callback_valid_date';
        
        $this->validation->set_rules($rules);
        
        $this->validation->set_message('required', '* required');
        $this->validation->set_message('isset', '* required');
        $this->validation->set_error_delimiters('<p class="error">', '</p>');
    }