I don't have a code sample, but you would need to create a custom session 
handler with session_set_save_handler() 
<http://php.net/manual/en/function.session-set-save-handler.php> as per the 
suggestion provided in this post 
<http://stackoverflow.com/questions/20272634/storing-session-data-in-database-and-memcache>
 on 
Stack Overflow.

On Monday, January 25, 2016 at 3:36:59 PM UTC-5, Alex Kerr wrote:
>
> Hi,
> I'm using standard PHP session stuff for my web app, which means session 
> data is stored in App Engine's shared memcache. Google's docs state that 
> this can get flushed so any logged in user sessions would fail. How exactly 
> do I add use of Datastore (or Cloud Storage?) into this process so that 
> memcache is still used unless it gets flushed in which case Datastore is 
> referred to? Is there a way to do this that minimises Datastore reads & 
> writes and thus minimises cost and latency? I'm ideally after code (or even 
> pseudocode) or even better a drop-in library or class :)
>
> Or, is a flush of the shared memcache so unlikely that it doesn't really 
> matter?
>
> Many thanks.
>

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