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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_Filter
  * @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    $Id$
  */
 
 /**
  * @see Zend_Filter_Interface
  */
 // require_once 'Zend/Filter/Interface.php';
 
 /**
  * @category   Zend
  * @package    Zend_Filter
  * @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_Filter_StringToLower implements Zend_Filter_Interface
 {
     /**
      * Encoding for the input string
      *
      * @var string
      */
     protected $_encoding = null;
 
     /**
      * Constructor
      *
      * @param string|array|Zend_Config $options OPTIONAL
      */
     public function __construct($options = null)
     {
         if ($options instanceof Zend_Config) {
             $options = $options->toArray();
         } else if (!is_array($options)) {
             $options = func_get_args();
             $temp    = array();
             if (!empty($options)) {
                 $temp['encoding'] = array_shift($options);
             }
             $options = $temp;
         }
 
         if (!array_key_exists('encoding', $options) && function_exists('mb_internal_encoding')) {
             $options['encoding'] = mb_internal_encoding();
         }
 
         if (array_key_exists('encoding', $options)) {
             $this->setEncoding($options['encoding']);
         }
     }
 
     /**
      * Returns the set encoding
      *
      * @return string
      */
     public function getEncoding()
     {
         return $this->_encoding;
     }
 
     /**
      * Set the input encoding for the given string
      *
      * @param  string $encoding
      * @return Zend_Filter_StringToLower Provides a fluent interface
      * @throws Zend_Filter_Exception
      */
     public function setEncoding($encoding = null)
     {
         if ($encoding !== null) {
             if (!function_exists('mb_strtolower')) {
                 // require_once 'Zend/Filter/Exception.php';
                 throw new Zend_Filter_Exception('mbstring is required for this feature');
             }
 
             $encoding = (string) $encoding;
             if (!in_array(strtolower($encoding), array_map('strtolower', mb_list_encodings()))) {
                 // require_once 'Zend/Filter/Exception.php';
                 throw new Zend_Filter_Exception("The given encoding '$encoding' is not supported by mbstring");
             }
         }
 
         $this->_encoding = $encoding;
         return $this;
     }
 
     /**
      * Defined by Zend_Filter_Interface
      *
      * Returns the string $value, converting characters to lowercase as necessary
      *
      * @param  string $value
      * @return string
      */
     public function filter($value)
     {
         if ($this->_encoding !== null) {
             return mb_strtolower((string) $value, $this->_encoding);
         }
 
         return strtolower((string) $value);
     }
 }