DatabaseSessionHandler::read() must return empty string instead of null

[RomeroMsk]

• Laravel Version: 5.5.2
• PHP Version: 7.1.9
• Database Driver & Version: pgsql

Description:

According to PHP manual, \Illuminate\Session\DatabaseSessionHandler::read() must return an empty string if nothing was read. Now it returns null in case of expired session or when payload is not set. It entails a warning:

session_start(): Failed to read session data

[themsaid]

Addressed in #21277

Thanks

[RomeroMsk]

@themsaid, thanks for the fast reply! But you also need to add return '' in the end of this method.