Why is it good save to save sessions in the database?
By saving a user’s session ID, IP and agent server-side (your database for example) you can compare the data saved in the database with the client. If a hacker steals someone’s session ID, the hacker just might not have a matching IP and/or user-agent, making the users not match which allows you to show or hide certain content.
What happens when an empty session is not retained?
Empty sessions aren’t retained. The session must have at least one value set to persist the session across requests. When a session isn’t retained, a new session ID is generated for each new request. The app retains a session for a limited time after the last request. The app either sets the session timeout or uses the default value of 20 minutes.
What’s the difference between session storage and local storage?
(In contrast, session storage, which is another HTML5 web storage API, deletes data stored when the browser closes.) Local storage is pure JavaScript. Likewise, while it still generates a plaintext document on the user’s device, local storage also allows up to 5MB of data to be stored (as compared to the 4KB of a cookie).
When to use server side sessions for sensitive information?
Use server-side sessions for sensitive information: Storing data on the server has several advantages when it comes to sensitive information. First, the developer can guarantee its security and has more control over individual sessions (they can be terminated instantly if necessary).
How to store preferences in the session variable?
Store preferences (background color, last 10 records looked at, categories) in session/cookie. On rendering of a page, refer to the Session/Cookie values (ensuring they are valid values and not null). Don’t store anything sensitive (use session). A cookie value should not grant/deny you access to anything (use session).
Where is the$ session variable stored in PHP?
$_SESSION is stored somewhere between requests, file on disk or database or something else depending on what you choose to use (default to file) $_SESSION is local to a single user on a single machine.
When to use caching variables in the$ _ session variable?
$_SESSION is local to a single user on a single machine. Under certain circumstances, sessions can block (rarely an issue, but i’ve run into it streaming flash) If the data you mean to cache is to be accessed by multiple users you’re quickly better off caching it seperately.