What are the potential consequences of setting session variables incorrectly in PHP?

Setting session variables incorrectly in PHP can lead to security vulnerabilities such as session hijacking or session fixation. It can also result in unexpected behavior in your application, as the data stored in session variables may not be accurate or consistent. To avoid these consequences, always sanitize and validate user input before storing it in session variables, and make sure to properly unset or destroy session variables when they are no longer needed. 

<?php
session_start();

// Sanitize and validate user input before storing in session variable
$_SESSION['username'] = filter_var($_POST['username'], FILTER_SANITIZE_STRING);

// Unset or destroy session variables when no longer needed
unset($_SESSION['username']);
session_destroy();
?>

Keywords

session variables PHP security vulnerabilities data leakage session hijacking

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