LEMON’s BLOG - 黎明博客

后来利用一个下午的时间对个思路进行了实现，基本上完成了。然后在第一时间发布在 CodeIgniter中国社区 ，以下便是：

在CI中使用PEAR类库的解决方法

现在基于第二个思路，添加PEAR类库载入通道，解决方法简单实现一下：

1、PEAR属于第三方类库，放在 application/libraries/PEAR 下面（当做自制类库对待）；
2、PEAR类库平铺展开，取消子目录以及编辑包含路径；
3、继承扩展Loader类库，添加pear载入方法，并添加两个私有内置方法 _ci_load_pear 和 _ci_init_pear；
4、默认先装载 PEAR.php基类（也可以取消，直接装载相应类库）；
5、然后装载相应的应用类库，需要提供类库前缀（因和CI命名约定不同），参数采用数组传递，然后初始化的时候利用implode 展开参数；
6、需要修改Base4.php文件，替换成扩展Loader类库；

扩展Loader类库代码如下：

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

/**
 * CodeIgniter
 *
 * LEMON
 * QQ 83997439
 * <a href="mailto:lemonfz@gmail.com">lemonfz@gmail.com</a>
 *
 */

class FG_Loader extends CI_Loader {

 /**
  * Constructor
  *
  * Sets the path to the view files and gets the initial output buffering level
  *
  * @access public
  */
 function FG_Loader()
 {
  parent::CI_Loader();
 }

 // --------------------------------------------------------------------

 /**
  * Class Loader
  *
  * This function lets users load and instantiate classes.
  * It is designed to be called from a user's app controllers.
  *
  * @access public
  * @param string the name of the class
  * @param mixed the optional parameters
  * @return void
  */
 function pear ($library = '', $prefix = '', $params = NULL)
 {
  if ($library == '')
  {
   return FALSE;
  }

  if (is_array($library))
  {
   foreach ($library as $class)
   {
    $this->_ci_load_pear($class, $prefix, $params);
   }
  }
  else
  {
   $this->_ci_load_pear($library, $prefix, $params);
  }

  $this->_ci_assign_to_models();
 }

 // --------------------------------------------------------------------     

 /**
  * Load class
  *
  * This function loads the requested class.
  *
  * @access private
  * @param  string the item that is being loaded
  * @param mixed any additional parameters
  * @return  void
  */
 function _ci_load_pear($class, $prefix, $params = NULL)
 {
  // Get the class name

  $subclass = APPPATH . 'libraries/PEAR/' . $class . EXT;

  // Is this a class extension request?
  if ( file_exists ( $subclass ) ) {
   $baseclass = APPPATH . 'libraries/PEAR/PEAR' . EXT;

   if ( ! file_exists ( $baseclass ) ) {
    log_message ( 'error', "Unable to load the requested class: " . $baseclass );
    show_error ( "Unable to load the requested class: " . $baseclass );
    return;
   }

   require_once $baseclass;
   require_once $subclass;

   $this->_ci_classes[] = $subclass;

   return $this->_ci_init_pear($class, $prefix, $params);
  }

  log_message('error', "Unable to load the requested class: ".$class);
  show_error("Unable to load the requested class: ".$class);
 }

 // --------------------------------------------------------------------

 /**
  * Instantiates a class
  *
  * @access private
  * @param string
  * @param string
  * @return null
  */
 function _ci_init_pear($class, $prefix = '', $params = NULL)
 { 

  $name = $prefix . $class;

  $var = "pear_" . strtolower ( $class );

  // Set the variable name we will assign the class to
  $classvar = ( ! isset($this->_ci_varmap[$var])) ? $var : $this->_ci_varmap[$var];

  // Instantiate the class
  $CI =&amp;amp; get_instance();
  if ($params !== NULL)
  {
   $CI->$classvar = new $name ( implode ( ',', $params ) );
  }
  else
  {
   $CI->$classvar = new $name;
  }
 }  

 // --------------------------------------------------------------------  

}

/* End of file FG_Loader.php */
/* Location: ./application/libraries/FG_Loader.php */

$this->load->pear ('SMTP', 'Net_' );

if ( isset ($this->pear_smtp) ) {
	echo "pear load OK!";
}
else {
	echo "pear load faild!";
}

最后，时间比较仓促，只是提供了一个思路的解决方法，希望有精力的朋友不断去完善，或者提出更好的方法。毕竟PEAR是一个非常丰富的类库，CI作为框架不可能实现自带很多类库，并做到功能很强大，所以直接引入PEAR类库未尝不是一个很好的办法。