a:3:{i:0;a:5:{s:4:"name";s:13:"group_user_id";s:4:"type";s:7:"integer";s:4:"null";b:0;s:7:"default";N;s:6:"length";i:11;}i:1;a:5:{s:4:"name";s:8:"group_id";s:4:"type";s:7:"integer";s:4:"null";b:0;s:7:"default";s:1:"0";s:6:"length";i:11;}i:2;a:5:{s:4:"name";s:7:"user_id";s:4:"type";s:7:"integer";s:4:"null";b:0;s:7:"default";s:1:"0";s:6:"length";i:11;}}