php - 语法错误，意外的 ';'

Question

我收到此错误：Parse error: syntax error, unexpected in /home/public_html/admin/login.php on line 15

<?PHP session_start();
$users = $_POST['txtuser'];
$passs = $_POST['txtpass'];
$passs= md5($passs);
include('../includes/myconnect.php');

$qry="SELECT * FROM users WHERE username='$users' and password='$passs'";
$res=mysql_query($qry);
$num=mysql_num_rows($res);
if($num>=1)
{
  $_SESSION['adminU']=$users;
  $_SESSION['adminP']=$passs;
  header("Location:emails.php");
}
else{header("Location:index.php?)msg=1";}
?>

如果我改变改变这个：

else{header("Location:index.php?)msg=1";}

对此：

else{header("位置：index.php?msg=1");}

然后我得到这个错误：

   Warning: mysql_num_rows() expects parameter 1 to be resource, boolean given in
 /home/...../public_html/admin/login.php on line 9

    Warning: Cannot modify header information - headers already sent by (output
 started at /home/...../public_html/admin/login.php:9) in
 /home/...../public_html/admin/login.php on line 15

Answer 1

改变这个：

else{header("Location:index.php?)msg=1";}

对此：

else{header("Location:index.php?msg=1");}

Answer 2

Warning: mysql_num_rows() expects parameter 1 to be resource, boolean given in
 /home/...../public_html/admin/login.php on line 9

此警告可能是因为您的查询返回空集结果。