What potential issues could arise from not properly setting up session variables in PHP?

One potential issue that could arise from not properly setting up session variables in PHP is that sensitive data could be exposed or manipulated by malicious users. To solve this issue, it is important to properly initialize the session at the beginning of each PHP script and securely set, retrieve, and unset session variables. 

// Start the session
session_start();

// Set a session variable
$_SESSION['username'] = 'example_user';

// Retrieve a session variable
$username = $_SESSION['username'];

// Unset a session variable
unset($_SESSION['username']);

Keywords

session variables PHP security vulnerabilities data loss session hijacking

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