Asking database for a list of usernames

I would like to print my usernames Into a list on my page. I've wrote my query correct im sure of that but i get this error:

Fatal error: Cannot redeclare get_users() (previously declared in C:wamp1wwwcms1user_list.php:70) in C:wamp1wwwcms1includesuser_list_functions.php on line 7

Here is the part of the user_list.php:70

function get_users($username){
    echo $username;
}

here is my function : User_list_functions.php:7

function get_users($username) { 
    global $connection;
    $query = "SELECT * FROM users_survey WHERE username = {$username} ORDER BY position ASC";
    $username = mysql_query($query, $connection);
    confirm_query($username);
}