Migrating from Cakephp 2 to Cakephp 3 one module at once

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Whoever googles this like I just did, take a look at CakePHP 2.x // 3.x Session.time inconsistent · Issue #10563 · cakephp/cakephp · GitHub

You will most likely have to update your CakePHP2 app/Config/core.php to have:

Configure::write('Session', array(
	'defaults' => 'php',
	'useForwardsCompatibleTimeout' => true, // ← this
));

Otherwise CakePHP2 will clear your entire session every time you visit the CakePHP3 website.

You will also want to make sure both apps are using:

  • the same session cookie_domain and
  • the same cookie name (CAKEPHP instead of PHPSESSID in my case)
  • different sessionKeys, or are aware of each other, otherwise Auth.User will get overwritten