Which language (such as python, ruby, or php and so on) do you recommend for using it as server language for site?

Answer 1

There isn't really a 1 to 1 for language to function. Pretty much all of the languages do the same things. php is by far the most popular server-side scripting language. It's easy to use, has amazing documentation and a huge community that is very helpful and responsive.
Python is very easy to learn making it the most popular beginner language out there, but it is full featured so it doesn't sacrifice any of the power.
It also depends on the environment you'll be using. php and IIS work but it takes some more hoops compared to php and Apache.

Answer 2

thx a lot for your help

Answer 3

Depends what you are trying to do.

Answer 4

Could you tell me some examples, (this language for this function...)

Answer 5

PHP or Django (Python) Probably