1: <?php
  2: /**
  3:  * This class provides cache storage in a PHP session.
  4:  *
  5:  * Copyright 2010-2012 Horde LLC (http://www.horde.org/)
  6:  *
  7:  * See the enclosed file COPYING for license information (LGPL). If you
  8:  * did not receive this file, see http://www.horde.org/licenses/lgpl21.
  9:  *
 10:  * @author   Michael Slusarz <slusarz@horde.org>
 11:  * @category Horde
 12:  * @license  http://www.horde.org/licenses/lgpl21 LGPL 2.1
 13:  * @package  Cache
 14:  */
 15: class Horde_Cache_Storage_Session extends Horde_Cache_Storage_Base
 16: {
 17:     /**
 18:      * Pointer to the session entry.
 19:      *
 20:      * @var array
 21:      */
 22:     protected $_sess;
 23: 
 24:     /**
 25:      * Constructor.
 26:      *
 27:      * @param array $params  Optional parameters:
 28:      * <pre>
 29:      * 'session' - (string) Store session data in this entry.
 30:      *             DEFAULT: 'horde_cache_session'
 31:      * </pre>
 32:      */
 33:     public function __construct(array $params = array())
 34:     {
 35:         $params = array_merge(array(
 36:             'sess_name' => 'horde_cache_session'
 37:         ), $params);
 38: 
 39:         parent::__construct($params);
 40: 
 41:         if (!isset($_SESSION[$this->_params['sess_name']])) {
 42:             $_SESSION[$this->_params['sess_name']] = array();
 43:         }
 44:         $this->_sess = &$_SESSION[$this->_params['sess_name']];
 45:     }
 46: 
 47:     /**
 48:      */
 49:     public function get($key, $lifetime = 0)
 50:     {
 51:         return $this->exists($key, $lifetime)
 52:             ? $this->_sess[$key]['d']
 53:             : false;
 54:     }
 55: 
 56:     /**
 57:      */
 58:     public function set($key, $data, $lifetime = 0)
 59:     {
 60:         $this->_sess[$key] = array(
 61:             'd' => $data,
 62:             'l' => $lifetime
 63:         );
 64:     }
 65: 
 66:     /**
 67:      */
 68:     public function exists($key, $lifetime = 0)
 69:     {
 70:         if (isset($this->_sess[$key])) {
 71:             /* 0 means no expire. */
 72:             if (($lifetime == 0) ||
 73:                 ((time() - $lifetime) <= $this->_sess[$key]['l'])) {
 74:                 return true;
 75:             }
 76: 
 77:             unset($this->_sess[$key]);
 78:         }
 79: 
 80:         return false;
 81:     }
 82: 
 83:     /**
 84:      */
 85:     public function expire($key)
 86:     {
 87:         if (isset($this->_sess[$key])) {
 88:             unset($this->_sess[$key]);
 89:             return true;
 90:         }
 91: 
 92:         return false;
 93:     }
 94: 
 95:     /**
 96:      */
 97:     public function clear()
 98:     {
 99:         $this->_sess = array();
100:     }
101: 
102: }
103: