php codeigniter 中的验证码显示致命错误

Question

我是 codeigniter 的新手，我在 codeigniter 中使用在线教程为我的登录表单创建了一个验证码。加载登录页面时出现以下错误：

> 致命错误：调用未定义的函数 base_url()

    $config = array(

        'img_path'      => 'captcha_images/',

        'img_url'       => base_url().'captcha_images/',

        'img_width'     => '150',

        'img_height'    => 50,

        'word_length'   => 8,

        'font_size'     => 16

    );

    $captcha = create_captcha($config);

i dont have any folder named 'captcha_images', all i have is a controller for captcha,config and the view in login. As am new to this, is it because i dont have a folder or i didnt call any library? please help me with this. thanks in advance

Answer 1

转到 application/config/autoload.php 下面写下这一行（您会在第 90 行找到 codeigniter 不错的文档） $autoload['helper'] = array('url');这将自动加载 url 帮助程序。 base_url() function is defined in url helper您可以为特定控制器手动加载它$this->load->helper('url');在控制器构造函数中写入此行或Controller action function