Are there any common pitfalls or errors to watch out for when utilizing session variables in PHP, especially in login scripts?

One common pitfall when using session variables in PHP login scripts is not properly sanitizing and validating user input before storing it in session variables. This can lead to security vulnerabilities such as session hijacking or injection attacks. To avoid this, always sanitize and validate user input before storing it in session variables. 

// Example of sanitizing and validating user input before storing in session variables
session_start();

// Sanitize and validate the username input
$username = filter_var($_POST['username'], FILTER_SANITIZE_STRING);
if (!empty($username)) {
    $_SESSION['username'] = $username;
}

// Sanitize and validate the password input
$password = filter_var($_POST['password'], FILTER_SANITIZE_STRING);
if (!empty($password)) {
    $_SESSION['password'] = $password;
}

Keywords

session variables PHP login scripts security vulnerabilities error handling

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