Did you try to do that?

If you want something like actual ping try these. These are ICMP based implementations.

stackoverflow.com/questions/20467432/php-how-to-p…

https://github.com/clue/php-icmp-react

However, you can check the response status of request using

stackoverflow.com/questions/3408049/getting-heade…

PHP Ping Script to Check Remote Server or Website

Watch: youtube.com/watch

Ping Speed Test