File Manager

<?php
#BEGIN_LICENSE
#-------------------------------------------------------------------------
# Module: CGExtensions (c) 2008-2014 by Robert Campbell
#         (calguy1000@cmsmadesimple.org)
#  An addon module for CMS Made Simple to provide useful functions
#  and commonly used gui capabilities to other modules.
#
#-------------------------------------------------------------------------
# CMSMS - CMS Made Simple is (c) 2005 by Ted Kulp (wishy@cmsmadesimple.org)
# Visit the CMSMS Homepage at: http://www.cmsmadesimple.org
#
#-------------------------------------------------------------------------
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# However, as a special exception to the GPL, this software is distributed
# as an addon module to CMS Made Simple.  You may not use this software
# in any Non GPL version of CMS Made simple, or in any version of CMS
# Made simple that does not indicate clearly and obviously in its admin
# section that the site was built with CMS Made simple.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
# Or read it online: http://www.gnu.org/licenses/licenses.html#GPL
#
#-------------------------------------------------------------------------
#END_LICENSE

abstract class friendly
{
  private $_friends;

  protected function __construct()
  {
    $this->add_friend(get_class($this));
  }

  protected function is_friendly()
  {
    $class = 'unknown';
    if( is_array($this->_friends) ) {
      $trace = debug_backtrace();
      if( isset($trace[2]['class']) ) $class = $trace[2]['class'];
      if( $class && in_array($class,$this->_friends) ) return;
    }

    throw new Exception('-- Access to invalid function from class ('.$class.')');
  }


  protected function add_friend($classname)
  {
    $tmp = explode(',',$classname);
    if( !is_array($tmp) ) return;

    if( !is_array($this->_friends) ) $this->_friends = array();

    foreach( $tmp  as $one ) {
      $this->_friends[] = $one;
    }
  }
} // end of class

?>