PHP page redirect

Question

I am working on a function where I want it to redirect to a file located in the same root folder. Is it possible? 

if (...) {
    // I am using echo here.
} else if ($_SESSION['qnum'] > 10) { 
    session_destroy();
    echo "Some error occured.";
    // Redirect to "user.php".
}

Can PHP make a redirect call after executing a function?