Domain Scanner & Extractor Script

I need a single, fully-automated script that does three things from start to finish:

1. Systematically scan the entire public zone so every domain—new, expiring, or otherwise—can be discovered and recorded in a clean, deduplicated list.
2. For each domain found, connect to the host (FTP/SFTP, HTTP, or any other dependable method you propose) and pull down every PHP file you can reach.
3. From those PHP files, extract the raw TXT content I specify and store it neatly in local folders that mirror the domain structure.

A concise log of successes, failures, and any unreachable hosts must accompany each run so I can track coverage. The finished deliverable should be a runnable script with basic setup notes (dependencies, config file, and one-line run command) plus a quick README explaining the core logic.

If you have an existing approach or toolset that speeds up the discovery phase, describe it briefly; otherwise, feel free to build from scratch in Python, Go, or another language you are confident will stay maintainable.