What potential pitfalls should PHP developers be aware of when working with session variables?

One potential pitfall when working with session variables in PHP is not properly sanitizing user input before storing it in the session. This can lead to security vulnerabilities such as session hijacking or injection attacks. To prevent this, always sanitize and validate user input before setting it in the session. 

// Sanitize and validate user input before setting it in the session
$user_input = $_POST['user_input']; // Assuming user input is coming from a form submission

// Sanitize user input using filter_var
$sanitized_input = filter_var($user_input, FILTER_SANITIZE_STRING);

// Validate sanitized input
if ($sanitized_input !== false) {
    $_SESSION['user_input'] = $sanitized_input;
} else {
    // Handle validation error
}

Keywords

session variables security vulnerabilities session hijacking session fixation session management

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