mysql_num_rows() expects parameter 1 to be resource, string given in

Question

I have read through many other threads about this exact problem, but i for some reason can not solve my problem. Really need some help.

if (!$username||!$passwo         


        

Answer 1

You can try like this

$sql= "SELECT * FROM Test WHERE username = '".$username."'";
$check = mysql_query($sql);

I think your $check returns null that is no user with this username and null can't be a parameter mysql_num_rows() function.

if($check)
{
    echo "Username already taken";
}
else
{
  echo "Username available";
  // do other actions
}