How can PHP developers ensure the security of session variables in their applications?

PHP developers can ensure the security of session variables in their applications by using session_regenerate_id() function to regenerate the session ID periodically and prevent session fixation attacks. Additionally, they should always validate and sanitize user input before storing it in session variables to prevent injection attacks. 

// Regenerate session ID to prevent session fixation attacks
session_regenerate_id();

// Validate and sanitize user input before storing in session variable
$_SESSION['user_id'] = filter_var($_POST['user_id'], FILTER_SANITIZE_NUMBER_INT);

Keywords

Session hijacking session fixation session_regenerate_id session_set_save_handler secure session handling

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