Ask you heroes PHP has the function of the host

I would like to ask you heroes PHP has the function of the host
For example, I want to crawl a page through PHP http://www.xxx.com/test.php
But www.xxx.com this domain name is needed in my local to do the following such a host to access the
123.1.1.1 www.xxx.com

I don't want to modify the/etc/hosts file on the server again
Is there any way I can set the domain name in PHP www.xxx.com is pointing to ip:123.1.1.1

------Solution--------------------
Explore

Reference:

Direct access to 123.1.1.1 IP no?

No, only access through the domain name
Is that PHP can do host in code?

