PDO::lastInsertId returns 18446744073709551615 instead of -1

Description

SQL to create max_id table:

CREATE TABLE `max_id` (
  `id` int NOT NULL AUTO_INCREMENT,
  `title` varchar(255) NOT NULL DEFAULT '',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2147483647 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci

The following code:

<?php
$pdo = new PDO("mysql:dbname=test;host=127.0.0.1", 'root', 'password');
$stmt = $pdo->prepare("INSERT INTO max_id (id, title) VALUES(?, ?)");
var_dump($stmt->execute([-1, "C"]));

Resulted in this output:

"18446744073709551615"

But I expected this output instead:

"-1"

I found that the problem may be in https://github.com/php/php-src/blob/master/ext/pdo_mysql/mysql_driver.c#L296

zend_u64_to_str does not recognize negative IDs.

PHP Version

8.1.11

Operating System

Ubuntu 22.04

Reproduce the result with the provided max_id table and PHP example, then inspect php-src/ext/pdo_mysql/mysql_driver.c around line 296 and the referenced zend_u64_to_str behavior. Confirm whether this doc-en issue requires a documentation update or belongs in php-src, and document the verified expected behavior and reproduction details.