PHP does not need Transactions
Just stumbled about a curiosity: there are 82 functions in the current PostgreSQL part of PHP. Functions like pg_select(), which takes from you the burden of writing a "SELECT ... FROM tablename" or pg_delete(), pg_insert() and pg_update() which all does, what do you expect: select, delete, insert or update and make the error checking. There are even 7 different functions for getting your results back into PHP.
But there is no function for starting, committing or rolling back a transaction. It seems, the message about the usefulness of transaction has yet not reached the PHP developers. Not that i'm surprised, the standard PHP/MySQL user seems to have no need for transactions ...