php ci框架编码

$db['default'] = array(
    'dsn'    => '',
    'hostname' => 'localhost',
    'username' => 'your_username',
    'password' => 'your_password',
    'database' => 'your_database',
    'dbdriver' => 'mysqli',
    'dbprefix' => '',
    'pconnect' => FALSE,
    'db_debug' => (ENVIRONMENT !== 'production'),
    'cache_on' => FALSE,
    'cachedir' => '',
    'char_set' => 'utf8',
    'dbcollat' => 'utf8_general_ci',
    'swap_pre' => '',
    'encrypt' => FALSE,
    'compress' => FALSE,
    'stricton' => FALSE,
    'failover' => array(),
    'save_queries' => TRUE
);

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Welcome extends CI_Controller {

    public function index()
    {
        $this->load->view('welcome_message');
    }
}

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

    $this->form_validation->set_rules('username', 'Username', 'required');
    $this->form_validation->set_rules('email', 'Email', 'required|valid_email');

    if ($this->form_validation->run() == FALSE) {
        $this->load->view('form');
    } else {
        $data = array(
            'username' => $this->input->post('username'),
            'email' => $this->input->post('email')
        );

        $this->load->model('user_model');
        $this->user_model->save_user($data);

        $this->load->view('form_success');
    }
}