Php Validation For Ntp Server

I want to add NTP validation in php anyone can help me ? some of the example of NTP server are :- nist1-ny.ustiming.org nist1-nj.ustiming.org nist1-pa.ustiming.org

Solution 1:

The NTP protocol seems to be pretty straight forward.

Here is a code snippet that claims to be able to fetch the date and time from a NTP server.

I have no experience with it, but it looks good.