Curious how safe can your PHP source code be in the servers worn. Would a webhost steal or so something with your code that you'd not need these to do?

Could? Yes. Would? Not unless of course they are possessed through the Russian Mafia. Make use of a trustworthy host company.

It is dependent in your hosting company's tos, as well as the type of service that you are having to pay.

If you are inside a hosting that is shared atmosphere, odds are the webhost will reserve the authority to review your code, just in case it's leading to performance issues for other clients.

If you are having to pay for any devoted server, your host most likely does not care that which you do on the website (unless of course you receive them RBL'ed) and wouldn't even bother making the effort to check out your code.