$_SESSION[] in php with example

$_SESSION[] is a function of php which helps you to save any text to a variable and allows you to transfer and use that variable in other page.

Here is an example of  $_SESSION[] which will help you to understand it's application better.

Before using $_SESSION[], we need to write session_start(), I would suggest to write this on start of your php page so that you don't have to see any error related to this.

Session_start();

$user=$_SESSION["user"];

$_SESSION["user"]='hello';

echo $user

Result- hello

Or in any other file of same folder.

Session_start();

echo $user

Result- hello

note- you can use any text in $_SESSION[]

Like $_SESSION['abc'] or any thing you want to use.

How to use $_SESSION[] in a login page to make it work( php).

Session_start();

$username$_SESSION["username"]

$_SESSION["username"]=$POST['username'];

Now, if you want that only user who are logged in can see a particular page then add this code in that page.

Session_start();

If($username=Null){

echo 'you are not logged in';

}else{

// Write your code //

};

Conclusion:-  $_SESSION[] is a very helpful function in php which helps you to save text in variables and use it in other file as we see in the example of login page above.