PDOStatement::$queryString "readonly" is not properly implemented

Description

The following code:

<?php
$stmt = new PDOStatement();
var_dump($stmt);
for($i=0;$i<10;$i++)
        $stmt->queryString = (string) $i;
var_dump($stmt);

Resulted in this output:

object(PDOStatement)#1 (0) {
  ["queryString"]=>
  uninitialized(string)
}
object(PDOStatement)#1 (1) {
  ["queryString"]=>
  string(1) "9"
}

But I expected this output instead:

object(PDOStatement)#1 (0) {
  ["queryString"]=>
  uninitialized(string)
}
Fatal error: Uncaught Error: Property queryString is read only in x.php:5

The reason this happens is because the following code is wrong:
https://github.com/php/php-src/blob/209e0d6ad29b1f49982c58088aadd9d1ad86a162/ext/pdo/pdo_stmt.c#L2008-L2014
The second loop iteration just reuses the cache slot and won't go through the write handler, bypassing the fake readonly check.
Either this should be relaxed or be fixed (i.e. "real readonly").

PHP Version

8.3+

Operating System

No response

Commencez par lire ext/pdo/pdo_stmt.c aux lignes indiquées par le lien et exécutez la reproduction de l’issue. C’est terminé lorsque les affectations répétées à PDOStatement::$queryString ne contournent plus la vérification readonly et produisent l’Error attendu ; une pull request ouverte traite déjà ce problème.