I have seen may tutorials and links for webmining on client, Is there any php based miner for server?
If you have access to the sever to run PHP code then you can just use a cpu or gpu monero miner anyway which are much faster and readily available for download and use.
As far as mining on a web client (not clear if that is what you're asking about):
It is being done with platforms like coinhive as a monitization strategy (ethically questionable imo) where one would alert the user about it and ask for permission but it is usually done by malware illegally in what is called Cryptohjacking. Essentially this is taking advantage of people's computers for ones own personal gain without any regard for those people or their devices