[3SidedSquare]

How will the script stop packets from hitting your server?

I'm not sure there's a way to do that, all you can do is not waste any more resources on it if it's spam, the point is to determine what is and is not spam.

I actually looked on Wikipedia for this, and most of the methods for blocking ddos involve hardware, what I'm proposing is closest to what wiki calls "Rate-based Intrusion Prevention System"

A rate-based IPS (RBIPS) must analyze traffic granularly and continuously monitor the traffic pattern and determine if there is traffic anomaly. It must let the legitimate traffic flow while blocking the DoS attack traffic.