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Handle session is very important when creating a member-based website where the user needs to register and login to their account to access website content.
With the help of a session, it is easier to identify the user and display the content accordingly.
In Codeigniter, require the loading session library to start work with Session. There are inbuilt methods are available that makes easier to handle session operations.
Sometimes required to restrict the user to only log in on a single system or a browser at a time.
To prevent the user from login on multiple systems or web browsers you need to generate a token on each successful login attempt.
Need to check the token on each page. If the token does not match then destroy the SESSION and log out the user.
In this tutorial, I show how you can prevent multiple logins of the same user with PHP.
With the use of AJAX, you can easily upload the selected file to your server and show a preview of it.
If you like to add a remove button to delete the file without page load then you again need to use AJAX to remove the file from the server.
I am using PHP to handle AJAX request on the server-side.
Within the project sometimes requires using multiple MySQL databases. It may be the existing database from another project or the new one.
To handle this with PHP requires to create separate connections for each database and use the connection accordingly while manipulating data in MySQL database.
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