CodeIgniter辅助之第三方类库third_party用法分析_PHP
本文实例分析了CodeIgniter辅助之第三方类库third_party用法。分享给大家供大家参考,具体如下:
third_party用来存放系统中引入的第三方类库,类库通常提供的功能比较丰富,相应的学习成本也要高些,系统中能用到功能有限,所以建议在引入类库时进行适当的封装,让系统中更方便使用,其他人使用时只需关注扩展的方法而无法关注具体的实现。以CI集成Twig模版为例吧。
首先需要下载Twig类库,并放在third_party中,然后在libraries中进行一次封装,示例如下:
<?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 */
模版的操作通常有一些配置的信息,这里通过config下的twig.php进行配置,通过CI load library的方式加载时,与类名同名的配置文件存在时,会自动以数组的方式将参数传入类的构造函数。
<?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 */
为了加载base_url site_url等函数到模版,类与CI产生了依赖,分离开可能更好,比如在serice中进行一次封装,增加一些自定义函数等,这样其他地方、其他系统也就很方便复用该类了。
更多关于codeigniter相关内容感兴趣的读者可查看本站专题:《codeigniter入门教程》和《CI(CodeIgniter)框架进阶教程》
希望本文所述对大家基于CodeIgniter框架的PHP程序设计有所帮助。

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