PHP Database serialized array issue
Add post meta auto-serializes arrays. And also get post meta, pass TRUE at the last argument: like get_post_meta($post_id, 'information', TRUE);
More details here: http://codex.wordpress.org/Function_Reference/add_post_meta
I have faced the same issue but I could used add_post_meta($post_id, 'information', array()); instead of add_post_meta($post_id, 'information', serialize(array()));try it you can resolve your issue..