XKCD Comic Email Subscription System 📬

A PHP-based web application that allows users to register their email, verify it with a 6-digit code, and receive a random XKCD comic via email. The system includes an unsubscribe feature, and all emails are sent using Gmail SMTP. User data is stored in a simple text file — no database is used.

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✨ Features

• 📧 Email registration and verification
• 🔑 6-digit email verification code system
• 📨 Sends random XKCD comics to verified users
• 🔗 Unsubscribe via email verification
• 🗂️ Email storage using registered_emails.txt

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⚙️ How It Works

1. User submits their email via a form.
2. A 6-digit verification code is emailed via Gmail SMTP.
3. On successful verification, the email is saved to registered_emails.txt.
4. send_xkcd.php (can be run manually or with CRON) fetches a random XKCD comic and emails it to all verified users.
5. Each email includes an unsubscribe link. Clicking it triggers a confirmation process.

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🔧 Tech Stack

• PHP
• Gmail SMTP (for sending HTML emails)
• HTML (for formatting)
• XKCD API (for fetching comic data)

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🛠 Setup Instructions

1. Clone the repo:

   git clone https://github.com/NikunjRajpara/XKCD-Comic.git
   cd XKCD-Comic

2. Configure your Gmail SMTP credentials in functions.php.

3. Host the src/ folder on a PHP-supported server (e.g. XAMPP)

4. To send comics manually, run:

bash php src/send_xkcd.php

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📩 Made with ❤️ by Nikunj Rajpara

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📜 License This project is open-source and available under the MIT License.