$con = mysql_connect("localhost","root","123456");
mysql_select_db("my_test", $con);
mysql_query("set names utf8");
$sql="SELECT * FROM Userinfo WHERE userName='".$userName."' AND pwd='".$pwd."'";
$result=mysql_query($sql);
$select=mysql_num_rows($result);
$a="no";
if ($select>0){$a="yes";}
echo $a;
mysql_close($con);
?>
