PDO inserts NULL byte at position 254 on SQL Server ntext column

Description

The following code:

<?php
try {
    $pdo = new PDO('odbc:DRIVER={SQL Server};SERVER=SHS\HS2017,49011;DATABASE=OIDDB', '', '');
    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $query = 'SELECT name, description, protected, visible, value FROM oidplus_config';
    $stmt = $pdo->query($query);
    $results = $stmt->fetchAll(PDO::FETCH_ASSOC);
    foreach ($results as $row) {
        if (($p = strpos($row['value'],"\0")) !== false) echo "PROBLEM: NULL BYTE FOUND AT ".$row['name']." AT POSITION $p\n";
    }
} catch (PDOException $e) {
    echo "Error: " . $e->getMessage();
}

Resulted in this output:

PROBLEM: NULL BYTE FOUND AT oidplus_private_key AT POSITION 254
PROBLEM: NULL BYTE FOUND AT oidplus_public_key AT POSITION 254

But I expected this output instead:

(Nothing)

I have verified that in the database the NULL byte is not there. In the database, the field has the correct length, in PHP strlen() is 1 byte too much, because of the inserted NULL byte

This seems to be very similar to the bug described at https://bugs.php.net/bug.php?id=74021

The SQL table is created as follows:

USE [OIDDB]
GO

SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

CREATE TABLE [dbo].[oidplus_config](
	[name] [nvarchar](50) NOT NULL,
	[value] [ntext] NOT NULL,
	[description] [nvarchar](255) NULL,
	[protected] [bit] NOT NULL,
	[visible] [bit] NOT NULL,
 CONSTRAINT [PK_oidplus_config] PRIMARY KEY CLUSTERED 
(
	[name] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO

ALTER TABLE [dbo].[oidplus_config] ADD  DEFAULT ('0') FOR [protected]
GO

ALTER TABLE [dbo].[oidplus_config] ADD  DEFAULT ('0') FOR [visible]
GO

PHP Version

8.4.1 (also tested with 8.3.6)

Operating System

Windows 10

Exécuter le reproducteur PDO ODBC fourni sur la colonne ntext de SQL Server et inspecter la valeur récupérée autour de la position 254. Aucun fichier source ni test n’est indiqué ; le travail est terminé lorsque PDO ne renvoie plus d’octet NULL inséré et que la longueur de la chaîne récupérée correspond à la valeur en base de données.