php session php session detection and logout

Copy code The code is as follows:

session_start();
$_SESSION['username']="zhuzhao";
?>

Copy code code As follows:

session_start();
unset($_SESSION['username']);
if(isset($_SESSION['username']))
echo "username already exists";
else
echo "username does not exist";
?>

The above introduces php session php session detection and logout, including php session content. I hope it will be helpful to friends who are interested in PHP tutorials.