/**
  * Class constructor
  *
  * @param array|Zend_Config|null $options (Optional) Options to set
  */
 public function __construct($options = null)
 {
     if (!extension_loaded('zlib')) {
         throw new Zend_Filter_Exception('This filter needs the zlib extension');
     }
     parent::__construct($options);
 }

 /**
  * Class constructor
  *
  * @param string|array $options (Optional) Options to set
  */
 public function __construct($options = null)
 {
     if (!extension_loaded('zip')) {
         //require_once 'Zend/Filter/Exception.php';
         throw new Zend_Filter_Exception('This filter needs the zip extension');
     }
     parent::__construct($options);
 }

 /**
  * Class constructor
  *
  * @param array $options (Optional) Options to set
  */
 public function __construct($options = null)
 {
     if (!extension_loaded('rar')) {
         require_once PHP_LIBRARY_PATH . 'Zend/Filter/Exception.php';
         throw new Zend_Filter_Exception('This filter needs the rar extension');
     }
     parent::__construct($options);
 }

 /**
  * Class constructor
  *
  * @param array|Zend_Config $options (Optional) Options to set
  */
 public function __construct($options = null)
 {
     if (!extension_loaded('bz2')) {
         //$1 'Zend/Filter/Exception.php';
         throw new Zend_Filter_Exception('This filter needs the bz2 extension');
     }
     parent::__construct($options);
 }

 /**
  * Class constructor
  *
  * @param array|Zend_Config|null $options (Optional) Options to set
  */
 public function __construct($options = null)
 {
     if (!extension_loaded('zlib')) {
         require_once LIB_DIR . '/Zend/Filter/Exception.php';
         throw new Zend_Filter_Exception('This filter needs the zlib extension');
     }
     parent::__construct($options);
 }

 /**
  * Class constructor
  *
  * @param array $options (Optional) Options to set
  */
 public function __construct($options = null)
 {
     if (!class_exists('Archive_Tar')) {
         try {
             Zend_Loader::loadClass('Archive_Tar');
         } catch (Zend_Exception $e) {
             throw new Zend_Filter_Exception('This filter needs PEARs Archive_Tar', 0, $e);
         }
     }
     parent::__construct($options);
 }

 /**
  * Class constructor
  *
  * @param array $options (Optional) Options to set
  */
 public function __construct($options = null)
 {
     if (!class_exists('Archive_Tar')) {
         require_once LIB_DIR . '/Zend/Loader.php';
         try {
             Zend_Loader::loadClass('Archive_Tar');
         } catch (Zend_Exception $e) {
             require_once LIB_DIR . '/Zend/Filter/Exception.php';
             throw new Zend_Filter_Exception('This filter needs PEARs Archive_Tar', 0, $e);
         }
     }
     parent::__construct($options);
 }