What is the difference between using $_SESSION['idnr'] and $idnr in PHP and how does it affect session management?

Using $_SESSION['idnr'] directly accesses the session variable 'idnr' stored in the session data, while $idnr is a regular PHP variable that may or may not be tied to session management. To ensure proper session management, it is recommended to use $_SESSION['idnr'] when working with session variables. 

// Using $_SESSION['idnr'] for session management
session_start();
$_SESSION['idnr'] = 12345;
$idnr = $_SESSION['idnr'];

Keywords

$_SESSION $idnr session management PHP difference

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