<?php

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

$pdo->beginTransaction();

var_dump($pdo->inTransaction());

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

var_dump($pdo->inTransaction());

bool(true)
bool(false)

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PHP 7.2, Zend 3.0, Symfony 4.0, Laravel 5.6, PHPUnit 6.5, Doctrine 2.8