private function showHelp()
{
echo "Usage:\n";
echo "php generate_classes.php <dbKey> <base class> [<path>]\n";
echo "Where\n";
echo "* dbKey is the name of a database key registered with LPC_DB.\n";
echo "* base class is the name of the base class for this application.\n";
echo " For example POLL_Base, PROF_Base, BLOG_Base, etc.\n";
echo " If the base class doesn't exist it will also be created.\n";
echo "* path is an optional parameter specifying where the classes should be written.\n";
echo " If left blank, the default path is used:\n";
echo " ".LPC_classes."\n";
echo "\n";
echo "Available database keys:\n";
echo "* ".implode("\n* ", LPC_DB::listAvailableKeys())."\n";
}
