session_start(); if (isset($_SESSION['error'])) { $errorMessage = getSessionError(); echo 'In this example, we start a session and check if the "error" session variable is set. If it is, we use the getSessionError() function to retrieve the error message and display it on the page. It's difficult to determine which package library this function belongs to without more context, as it's a very general function that could be used in a wide variety of applications.' . $errorMessage . '
'; }