<?php

$pdo = new PDO('mysql:dbname=boo;host=127.0.0.1');

$pdo->beginTransaction();

dump($pdo->inTransaction());

// error happens and rollback is invoked
$pdo->rollBack();

dump($pdo->inTransaction());

^ true

^ false

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PHP 8.3, Laminas MVC 3.2, Symfony 5.2, Laravel 8.28, PHPUnit 9.5, Doctrine ORM 2.8