Select Input of All Tables

I want to generate a select input (drop down) of all tables with the values as their IDs. When I first looked at this each table also has a post (saved as a post in the custom post type tablepress_table) however the table is not actually stored with the post.

Therefore I either need to able to get a list of all tables with their values as the table IDs or how can I get a table ID from its post ID.

I see that the associated on posts and tables is stored in the options table as tablepress_tables. However when I get that options it just returns a string like so:

string(36) "{"last_id":2,"table_post":{"1":118}}"

I would have expected an array. How can I use this to get the table ID from the post ID please. You help is much appreciated.

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