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 <?php
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category   Zend
  * @package    Zend
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 /**
 * @category   Zend
 * @package    Zend
 * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
 class Zend_Exception extends Exception
 {
     /**
      * @var null|Exception
      */
     private $_previous = null;
 
     /**
      * Construct the exception
      *
      * @param  string $msg
      * @param  int $code
      * @param  Exception $previous
      * @return void
      */
     public function __construct($msg = '', $code = 0, Exception $previous = null)
     {
         if (version_compare(PHP_VERSION, '5.3.0', '<')) {
             parent::__construct($msg, (int) $code);
             $this->_previous = $previous;
         } else {
             parent::__construct($msg, (int) $code, $previous);
         }
     }
 
     /**
      * Overloading
      *
      * For PHP < 5.3.0, provides access to the getPrevious() method.
      *
      * @param  string $method
      * @param  array $args
      * @return mixed
      */
     public function __call($method, array $args)
     {
         if ('getprevious' == strtolower($method)) {
             return $this->_getPrevious();
         }
         return null;
     }
 
     /**
      * String representation of the exception
      *
      * @return string
      */
     public function __toString()
     {
         if (version_compare(PHP_VERSION, '5.3.0', '<')) {
             if (null !== ($e = $this->getPrevious())) {
                 return $e->__toString()
                        . "\n\nNext "
                        . parent::__toString();
             }
         }
         return parent::__toString();
     }
 
     /**
      * Returns previous Exception
      *
      * @return Exception|null
      */
     protected function _getPrevious()
     {
         return $this->_previous;
     }
 }