session_start(); $userID = $_SESSION['userID']; echo "User ID: " . $userID;
session_start(); if (isset($_SESSION['userID'])) { echo "You are logged in!"; } else { echo "You are not logged in."; }In this example, we use the isset() function to check if the $_SESSION['userID'] variable is set. If it is set, we assume that the user is logged in and output a message to the user. If it is not set, we assume that the user is not logged in and output a different message. Package/Library: No package/library is required in this example. Overall, the Session getUserID function is a useful tool for working with PHP sessions and identifying users who are accessing your website or application. No external package/library is required to use this function.