For the time of uCoz web-services existence, its biggest drawback (in the opinion of some users) was lack of PHP-scripts usage.
This feature was introduced in March, 2011. It is a paid service, which can be purchased within a package of services and as a separate services ($1.99 per month).
When activating PHP service for the website, the account is created on a dedicated server. The execution of all PHP-scripts is done there.
Access to the following account, data upload, change and removal is accomplished via FTP...