How to write data via php to MS SQL database (not MySQL) in windows-1251 encoding?

Question

PHP

There is a form of recording in the database, of course, there is also code that almost successfully implements this, but not in the correct encoding.
Who can help?

<?php
require 'db.php';

$id = $_POST['id'];
$reason = $_POST['reason'];
$comment = $_POST['comment'];
$approve_name = $_POST['approve_name'];
$appr = $_POST['appr'];

print_r($_POST);

if($reason != '') {
$upd_data = $DBH->prepare("SET NAMES cp1251; UPDATE SCUD2 SET reason=:reason, comment=:comment WHERE SCUDID=:id");
$upd_data->execute(array(
          'id'=>$id,
          'reason'=>$reason,
          'comment'=>$comment,
          ));
}

if($approve_name != '') {
  if($appr == '') {
    $approve_name = '';
  }
$upd_data = $DBH->prepare("SET NAMES cp1251; UPDATE SCUD SET state=:state, approve_name=:approve_name WHERE SCUDID=:id");
$upd_data->execute(array(
          'id'=>$id,
          'state'=>$appr,
          'approve_name'=>$approve_name,
          ));
}
?>

Answer 1

php.net/manual/en/function.iconv.php

Answer 2

set names does not set the target encoding, but the source
one. You don't need to specify the target one, the base already knows it