For those like me that didn't know what ngrok is, "ngrok exposes local servers behind NATs and firewalls to the public internet over secure tunnels"[1]. So it allows you to easily expose internal services publicly, letting you (for example) show someone outside your network a website in your local development environment, without having to deploy it externally into some sort of live environment.

Also, not sure why so many people seem to take "... written in PHP" as a gauntlet slap to their own face, instead of some additional technical information.

If you have nothing to add to the conversation other than witty snark about PHP, maybe your time would be better spent writing a competing open source product in a language of your choice, giving it away for free, and then letting users compare their pros and cons?

1. https://ngrok.com/product