PHP mysql_query, integer returned instead of resource
function sqlResult($query)
{
    return mysql_query($query)
    or die("SQL Query: " . $query . "<br />SQL Error: " . mysql_error());
}

PHP Warning:  mysql_fetch_array() expects parameter 1 to be resource,
              boolean given in /var/www/login/login_submit.php on line 42

$sqlQuery =
  "SELECT userID, username, password, access_level
   FROM users
   WHERE username = '{$username}'
   AND (password = '{$password_sha1}' OR password = '{$password_sha256}')";

return (mysql_query(...)) or die(...);

function sqlQuery(...) {
    $result = mysql_query(...);
    if ($result === FALSE) {
        die(mysql_error(...));
    }
    return $result;
}