With the continuous development of open source and web development, developers' demand for various frameworks, tools and technologies continues to grow. As we all know, CodeIgniter is one of the most popular PHP frameworks. On its basis, combined with the modern template engine Twig, high-quality web applications can be built quickly and easily. Therefore, this article will introduce how to use the Twig template engine in the CodeIgniter framework.

1. What is Twig

Twig is a modern, elegant and flexible PHP template engine. It is famous for its rich functions, easy expansion, high efficiency, and high-quality output. Compared with PHP's built-in template engine, the Twig template engine has more powerful syntax and more flexible settings, and can also help us complete web applications more easily.

2. How to use Twig in CodeIgniter

1. Install Twig

First, we need to download Twig and place it at the root of the CodeIgniter application Under contents. Twig can be installed using the following instructions:

composer require "twig/twig:^3.0"

2. Configuring CodeIgniter

In the config.php file of the CodeIgniter application, we need to set up the Twig template engine.

First, you need to enable Composer automatic loading (if it is not already enabled):

// 配置composer-autoloader.php路径
$config['composer_autoload'] = realpath(APPPATH . '../vendor/autoload.php');

Then, set the configuration items of Twig:

// 配置Twig
$config['twig']['template_dir'] = VIEWPATH;
$config['twig']['cache_dir'] = APPPATH . 'cache/twig/';
$config['twig']['debug'] = ENVIRONMENT !== 'production';
$config['twig']['auto_reload'] = true;

Finally, add in the config.php file Twig configuration items:

$config['default_view_renderer'] = 'Twig';

3. Create Twig view file

The syntax of Twig template engine is concise, clear and highly readable. In Twig syntax, variables are enclosed using double curly braces {{ ... }} and control structures are implemented using open tags {% ... %}. We can place the Twig view files in the application/views directory:

  
    
    
  

  
    
{{ heading }}
    
{{ content }}
  

4. Create Controller

Next, we need to create a controller to handle the view and data :

class Pages extends CI_Controller {

    public function view($page = 'home')
    {
        if ( ! file_exists(APPPATH.'views/pages/'.$page.'.php'))
        {
            // 页面不存在
            show_404();
        }

        $data['title'] = ucfirst($page); // 将页面名称首字母大写
        $data['heading'] = 'Welcome to my website!';
        $data['content'] = 'This is some sample content.';

        $this->twig->display('pages/'.$page, $data);
    }
}

5. Run the application

Now, we have successfully added the Twig template engine to the CodeIgniter application. By visiting http://example.com/index.php/pages/view, we can see the page rendered using Twig.

3. Conclusion

Using the Twig template engine can help us build Web applications more efficiently and quickly. In the CodeIgniter framework, how to use the Twig template engine is also a good choice. I believe that through the introduction in this article, every developer can quickly master how to use Twig.

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