mysql_num_rows(): supplied argument is not a valid MySQL result resource [duplicate]
You need to check the return value of mysql_query $query = ‘YOUR QUERY’; $result = mysql_query($query); if (!$result) { trigger_error(‘Invalid query: ‘ . mysql_error().” in “.$query); } // go ahead and fetch the results using mysql_num_rows. If mysql_query fails it returns boolean false instead of a resource. When you pass this boolean value to mysql_num_rows … Read more