CI: Form Validate

index.php

public function validate()
    {
        $this->load->library('form_validation');

        $validation_rules = [
            [
                'field' => 'email',
                'rules' => 'trim|required|valid_email'
            ],
            [
                'field' => 'password',
                'rules' => 'trim|required'
            ]
        ];

        $this->form_validation->set_rules($validation_rules);

        if($this->form_validation->run()) return TRUE;
        else throw new Exception('error_form_validation');
    }