php - Convert mysql_result to mysqli_result -

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i need help. convert mysql_result mysqli_result.

    function user_exists($username) {       $username = sanitize($username);        return (mysql_result(mysql_query("select count(`user_id`) `users` `username` = '$username'"), 0) == 1) ? true : false;     }      function user_exists($username) {       $username = sanitize($username);        return (mysqli_result(mysqli_query($con7,"select count(`user_id`) `users` `username` = '$username'"), 0) == 1) ? true : false;     }

i tried adding code. still not working.

    function mysqli_result($res, $row, $field=0) {        $res->data_seek($row);        $datarow = $res->fetch_array();        return $datarow[$field];      }

edited. $con7 such 

    $con7 = mysqli_connect('localhost','root', '', 'database') or exit($connect_error);


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