added list_system_var_keys

application/libraries/Aauth.php

@@ -1889,6 +1889,22 @@ class Aauth {
         }
     }
     
+     /**
+     * List System Variable Keys
+     * Return array of variable keys or false
+     * @return bool|array , false if var is not set, the value of var if set
+     */
+
+    public function list_system_var_keys(){
+	$query = $this->CI->db->select('key');
+	$query = $this->CI->db->get( $this->config_vars['system_variables'] );
+	// if variable not set
+	if ($query->num_rows() < 1) { return false;}
+	else {
+	    return $query->result();
+	}
+    }
+
 } // end class
 
 // $this->CI->session->userdata('id')