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

Empieza leyendo ext/pdo/pdo_stmt.c en las líneas enlazadas y ejecuta la reproducción del issue. Se considera terminado cuando las asignaciones repetidas a PDOStatement::$queryString ya no eludan la comprobación readonly y produzcan el Error esperado; ya existe un pull request abierto que aborda este problema.