Please run it on localhost:8000 or either change the value of BASE_URL variable in src/function.php accordingly

Custom Features Implemented

1. Rate Limiting System

• A rate limit of 60 seconds per email submission is enforced to prevent spamming.
• Implemented using a rate_limit.txt file with timestamps for each email.

2. HTML Email Templates

• All outgoing emails (verification, unsubscription, comic delivery) follow the exact HTML formatting as per requirements.
• Includes a visible Unsubscribe link in the comic emails.

3. Robust Code Structure

• Clean separation of logic inside functions.php using modular, reusable functions.
• Strict adherence to file names and function names — no deviations from the given stubs.

4. WSL-Compatible CRON Setup

• Developed and tested the entire system on WSL with a fully working setup_cron.sh.
• Includes manual testing capability via:

  php /mnt/c/Users/user/OneDrive/Desktop/xkcd-Rohan29-De-main/src/cron.php
  

Comprehensive User Flowchart

Subscribe Flow

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Cron Job Flow

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Unsubscribe Flow