$connect = mysqli_connect("localhost","root","","CSDL");
mysqli_query($connect,"SET NAMES 'UTF8'");

if ($_SERVER['REQUEST_METHOD'] == 'POST'
    && !empty($_POST['userp'])
    && !empty($_POST['passp']) )
   {
    ‎$user = mysql_escape_string($_POST['userp']);
    $pass = mysql_escape_string($_POST['passp']);

    $select_mem = " SELECT *
                FROM user
            WHERE user_name='$user' AND pass='$pass'";

    $query_toMem = mysqli_query($connect,$select_mem);

    echo mysqli_num_rows($query_toMem);
  }