What are common pitfalls when using session variables in PHP?

One common pitfall when using session variables in PHP is not properly sanitizing user input before storing it in a session variable, which can lead to security vulnerabilities such as XSS attacks. To solve this issue, always sanitize any user input before storing it in a session variable using functions like htmlspecialchars(). 

// Sanitize user input before storing it in a session variable
$_SESSION['username'] = htmlspecialchars($_POST['username']);

Keywords

session variables security vulnerabilities session hijacking session fixation session management

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