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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_Service_Console
  * @subpackage Exception
  * @version    $Id$
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @copyright  Copyright (c) 2009 - 2011, RealDolmen (http://www.realdolmen.com)
  * @license    http://phpazure.codeplex.com/license
  */
 
 /**
 * @see Zend_Service_Console_Command_ParameterSource_ParameterSourceInterface
 */
 // require_once 'Zend/Service/Console/Command/ParameterSource/ParameterSourceInterface.php';
 
 /**
  * @category   Zend
  * @package    Zend_Service_Console
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @copyright  Copyright (c) 2009 - 2011, RealDolmen (http://www.realdolmen.com)
  * @license    http://phpazure.codeplex.com/license
  */
 class Zend_Service_Console_Command_ParameterSource_Env
   implements Zend_Service_Console_Command_ParameterSource_ParameterSourceInterface
 {
   /**
    * Get value for a named parameter.
    *
    * @param mixed $parameter Parameter to get a value for
    * @param array $argv Argument values passed to the script when run in console.
    * @return mixed
    */
   public function getValueForParameter($parameter, $argv = array())
   {
     // Default value
     $parameterValue = null;
 
     // Fetch value for parameter
     foreach ($parameter->aliases as $alias) {
       while (strpos($alias, '-') !== false) {
         $alias = substr($alias, 1);
       }
       $value = getenv($alias);
 
       if (!is_null($value) && $value !== false) {
         $parameterValue = $value;
         break;
       }
     }
 
     if (strtolower($parameterValue) == 'true') {
       $parameterValue = true;
     } else if (strtolower($parameterValue) == 'false') {
       $parameterValue = false;
     }
 
     // Done!
     return $parameterValue;
   }
 }