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Php login register form


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i got a problem with a part of my code :


// #1
function user_exists ($username) {
    $username = sanitize ($username);
    $query = mysql_query ("SELECT COUNT (user_id) FROM user WHERE username = '$username'");
    return (mysql_result($query, 0) == 1) ? true : false;
function user_active($username) {
$username = sanitize($username);
  return (mysql_result( mysql_query("SELECT COUNT(`user_id`) FROM `user` WHERE `username` ='$username' AND `active` = 1 "), 0) == 1) ? true : false;

Warning: mysql_result() expects parameter 1 to be resource, boolean given in C:\xampp\htdocs\login\core\functions\users.php on line 9
this is the error i get ... 
i am building this based on a login & register tutorial on youtube but i did it the same way he did it and told how to ... i did let the code run through a php valdation check and it told me that mysql_query and mysql_result were outdated code ?!
just need help thanks alot 
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