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

Beginne damit, ext/pdo/pdo_stmt.c in den verlinkten Zeilen zu lesen und die Reproduktion aus dem Issue auszuführen. Erledigt ist es, wenn wiederholte Zuweisungen an PDOStatement::$queryString die readonly-Prüfung nicht mehr umgehen und den erwarteten Error erzeugen; ein offener Pull Request behebt dieses Problem bereits.