function Delete_v2($mysqli,$table_name, $where_clause=''){   
  $whereSQL = '';
  if(!empty($where_clause)) {
    // check to see if the 'where' keyword exists
    if(substr(strtoupper(trim($where_clause)), 0, 5) != 'WHERE') {
      // not found, add keyword
      $whereSQL = " WHERE ".$where_clause;
    } else {
      $whereSQL = " ".trim($where_clause);
    }
  }
  // build the query
  $sql = "DELETE FROM `".$table_name."` ".$whereSQL;

  $dt['sql']=$sql.";";
  // run and return the query result
  // return mysqli_query($mysqli,$sql);
  if(mysqli_query($mysqli,$sql)) {
    $dt['result']="Success";
  } else {
    $dt['result']="Error";    
  }  
  return $dt;
}