在会话中保存数据库排序

Thanks to folks here on stackoverflow I have mastered most aspects of database (sqlite) control using php in a matter of days!!! And managed to build a basic crud cms. I am now making minor improvements and stuck on 'saving database sort in a session'. When I click off the page and then return, the session is not saved. I have got so far and this seems a frustrating stumbling block. This is what I have:Thanks to folks here on stackoverflow I have ma