Usage analysis of third-party library third_party assisted by CodeIgniter

This article analyzes the usage of the third-party class library third_party assisted by CodeIgniter. Share it with everyone for your reference, the details are as follows:

third_party is used to store third-party class libraries introduced in the system. Class libraries usually provide richer functions, and the corresponding learning costs are higher, and the functions that can be used in the system are limited. , so it is recommended to carry out appropriate encapsulation when introducing the class library to make it more convenient to use in the system. When other people use it, they only need to pay attention to the extended method and cannot pay attention to the specific implementation. Take the CI integrated Twig template as an example.

First you need to download the Twig class library and place it in third_party, and then encapsulate it in libraries. The example is as follows:

<&#63;php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
require APPPATH.'third_party/Twig/Autoloader.php';
/**
 * Twig模版引擎
 *
 */
class Twig
{
  public $twig;
  public $config;
  private $data = array();
  /**
   * 读取配置文件twig.php并初始化设置
   * 
   */
  public function __construct($config)
  {
    $config_default = array(
      'cache_dir' => false,
      'debug' => false,
      'auto_reload' => true,
      'extension' => '.tpl',
    );
    $this->config = array_merge($config_default, $config);
    Twig_Autoloader::register ();
    $loader = new Twig_Loader_Filesystem ($this->config['template_dir']);
    $this->twig = new Twig_Environment ($loader, array (
        'cache' => $this->config['cache_dir'],
        'debug' => $this->config['debug'],
        'auto_reload' => $this->config['auto_reload'], 
    ) );
    $CI = & get_instance ();
    $CI->load->helper(array('url'));
    $this->twig->addFunction(new Twig_SimpleFunction('site_url', 'site_url'));
    $this->twig->addFunction(new Twig_SimpleFunction('base_url', 'base_url'));
  }
  /**
   * 给变量赋值
   * 
   * @param string|array $var
   * @param string $value
   */
  public function assign($var, $value = NULL)
  {
    if(is_array($var)) {
      foreach($val as $key => $val) {
        $this->data[$key] = $val;
      }
    } else {
      $this->data[$var] = $value;
    }
  }
  /**
   * 模版渲染
   * 
   * @param string $template 模板名
   * @param array $data 变量数组
   * @param string $return true返回 false直接输出页面
   * @return string
   */
  public function render($template, $data = array(), $return = FALSE)
  {
    $template = $this->twig->loadTemplate ( $this->getTemplateName($template) );
    $data = array_merge($this->data, $data);
    if ($return === TRUE) {
      return $template->render ( $data );
    } else {
      return $template->display ( $data );
    }
  }
  /**
   * 获取模版名
   * 
   * @param string $template
   */
  public function getTemplateName($template)
  {
    $default_ext_len = strlen($this->config['extension']);
    if(substr($template, -$default_ext_len) != $this->config['extension']) {
      $template .= $this->config['extension'];
    }
    return $template;
  }
  /**
   * 字符串渲染
   * 
   * @param string $string 需要渲染的字符串
   * @param array $data 变量数组
   * @param string $return true返回 false直接输出页面
   * @return string
   */
  public function parse($string, $data = array(), $return = FALSE)
  {
    $string = $this->twig->loadTemplate ( $string );
    $data = array_merge($this->data, $data);
    if ($return === TRUE) {
      return $string->render ( $data );
    } else {
      return $string->display ( $data );
    }
  }
}
/* End of file Twig.php */
/* Location: ./application/libraries/Twig.php */

The operation of the template usually has some configuration information, which is done here through twig.php under config Configuration, when loaded through the CI load library, if a configuration file with the same name as the class name exists, the parameters will be automatically passed into the constructor of the class in the form of an array.

<?php
// 默认扩展名
$config['extension'] = ".tpl";
// 默认模版路劲
$config['template_dir'] = APPPATH . "views/";
// 缓存目录
$config['cache_dir'] = APPPATH . "cache/twig/";
// 是否开启调试模式
$config['debug'] = false;
// 自动刷新
$config['auto_reload'] = true;
/* End of file twig.php */
/* Location: ./application/config/twig.php */

In order to load base_url site_url and other functions into the template, the class has a dependency on CI, and it may be better to separate it. For example, encapsulate it once in serice, add some custom functions, etc., so that other places and other systems can It is very convenient to reuse this class.

Readers who are interested in more codeigniter-related content can check out the special topics on this site: "Introduction to codeigniter tutorial" and "Advanced tutorial on CI (CodeIgniter) framework"

I hope that what is described in this article will be helpful to everyone's PHP program design based on the CodeIgniter framework. helped.

The above introduces the usage analysis of the third-party class library third_party assisted by CodeIgniter, including the content. I hope it will be helpful to friends who are interested in PHP tutorials.