How to catch errors when writing and updating to the database from a function?

Question

PHP

I have two functions that perform the usual insert and update records in the database

user_insert($args); //эта функция добавляет запись в бд
user_update($args);  //эта обновляет запись в базе

I need if the first function will cause an error, so that the second function would not work.

I saw a similar solution on one English-speaking forum, but it was not marked with a solution:

$pdo->beginTransaction();
try {
  user_insert($args);
  user_update($args);
} catch (\PDOException $e) {
    $pdo->rollback();
    throw $e;
}

Or, in case of an error, the script will stop by default and all these things are not needed? Tell me please