Contact-Form-PHP

A modern, secure, and customizable contact form for any PHP project Built with Bootstrap 5, powered by AJAX, PHPMailer, and Google reCAPTCHA v3 — no jQuery, no bloat
🔐 Designed for performance, accessibility, and clean code

✨ Features

• PHP 8+ Ready – Strictly typed and future-proof
• Bootstrap 5 UI – Responsive and accessible
• AJAX Submission – No page reloads
• Google reCAPTCHA v3 – Invisible spam protection
• SMTP Delivery with PHPMailer – Secure emails
• Auto-reply to users – Confirm receipt
• Disposable email detection – Block throwaway addresses
• Honeypot spam traps – Catch bots
• Session-based rate limiting – Prevent abuse
• Easy customization – Tailor fields and styles

🚀 Live Demo

🔗 View the demo

📦 Quick Start

1. Clone the repository :

git clone https://github.com/raspgot/Contact-Form-PHP.git

Or download as ZIP

2. Run it locally :

Use a local PHP server like XAMPP, MAMP or PHP's built-in server :

php -S localhost:8000

⚙️ Configuration

1. Set credentials

Get your reCAPTCHA secret key at Google reCAPTCHA

In AjaxForm.php, edit:

const SECRET_KEY    = 'your_recaptcha_secret_key';
const SMTP_HOST     = 'smtp.yourprovider.com';
const SMTP_USERNAME = 'you@example.com';
const SMTP_PASSWORD = 'yourpassword';
const SMTP_SECURE   = 'tls';
const SMTP_PORT     = 587;

Note: Enable php_curl in php.ini:

extension=curl

2. Set reCAPTCHA site key in JS

In AjaxForm.js:

const RECAPTCHA_SITE_KEY = 'YOUR_RECAPTCHA_SITE_KEY';

And in index.html:

<script src="https://www.google.com/recaptcha/api.js?render=YOUR_RECAPTCHA_SITE_KEY"></script>

✨ Advanced Features

• Regex-based User-Agent detection (blocks common bots)
• DNS and disposable email validation (rejects throwaway emails)
• reCAPTCHA score filtering (requires min. score 0.5)
• Honeypot hidden field (traps bots)
• Session rate limiting (max 3 submissions per hour)
• Input sanitization to prevent header injection and XSS
• Automatic user acknowledgment email
• Customizable email template with dynamic data

🛠️ Customization

✏️ Change validation messages

Edit the messages in index.html:

<div class="valid-feedback">Looks good !</div>
<div class="invalid-feedback">Please provide a valid name.</div>

✉️ Customize the confirmation email

The file email_template.php contains the HTML template for the confirmation email automatically sent to the user after form submission

You can modify this file to:

• Change the content of the email
• Add your logo and branding
• Adjust formatting and styles

⚡ Adjust session rate limiting

By default, the form limits users to 5 submissions per hour to prevent abuse

To change this limit:

1. Open AjaxForm.php
2. Look for the following lines:

const MAX_ATTEMPTS = 5;
const RATE_LIMIT_DURATION = 3600; // seconds (3600 = 1 hour)

3. Modify MAX_ATTEMPTS and RATE_LIMIT_DURATION to suit your needs

🙌 Contributing

Feel free to open issues or submit pull requests :)

🧑‍💻 Author

Developed by Raspgot — contact@raspgot.fr

If you find this project useful, please ⭐ star the repository !

📚 Dependencies

• PHPMailer
• Bootstrap