Comparing
#6 with
#7
Content
Original source code and idea are from: [PHP, PDO & Nested Transactions](http://www.kennynet.co.uk/2008/12/02/php-pdo-nested-transactions/).
Tested with: MySQL 5.1.30 + Yii 1.1.8.
Problem:
Say there is service layer in an application, and one service may use others. No
w each service deals will complex business logic will needs to wrap that into transactions.
If there are services A and B here's how it might happen:
```php
class ServiceA {[...]
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