Mix of CakePHP 1.3 and CakePHP 3x ?

Hi All,

i need advice. I have an legacy backoffice app made in cakephp 1.3. Its quite huge project and now we want to add new features. (more less standalone modules which don't affect existing app)
The plan is to move whole app to newver CakePHP version (longterm plan), so we decided to create these new features already in new version of CakePHP (wuld be in subdomain, or subfolder) so the code base will not affect the old 1.3 app. When the new modules are ready we will slowly move all the rest of backoffice to new version.

Now, the requirements are that the actual users should not even see any difference that the new module is running under new CakePHP version - which means we need to somehow seamlessly use the login session in both CakePHP versions (1.3 and 3x).  So for user can go from one part of App (1.3) to another part (3x) and back without the need of new login etc.

Has anyone suggestions or experience with this kind of situation? 
How to handle the user sessions between the 2 apps, are there any problems to watch out ?

any help is appreciated

best regards,
Martin

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