What are some best practices for managing sessions in PHP applications, especially when dealing with multiple apps?

When managing sessions in PHP applications, especially when dealing with multiple apps, it's important to ensure each app has a unique session identifier to prevent conflicts. One way to achieve this is by setting a custom session name for each app. This can be done by calling session_name() with a unique identifier for each app.

// Set a custom session name for each app
session_name("app1_session");
session_start();

// App 1 code here

// Set a custom session name for another app
session_name("app2_session");
session_start();

// App 2 code here