CaptchaFun Lite - Fun Secure PHP Captcha

**Stop bots. Delight users. One file.**

CaptchaFun Lite is the fastest way to add beautiful, secure CAPTCHA protection to any PHP form. Unlike complex solutions that require databases, admin panels, or third-party API keys, CaptchaFun works out of the box with a single PHP file.

Your users get fun, engaging challenges. Bots get blocked. You get peace of mind.

**Why CaptchaFun Lite?**

Most CAPTCHA solutions are ugly, frustrating, or require complex setups. CaptchaFun changes that with:

- **5 unique challenge types** that keep bots guessing and users engaged - **5 premium themes** to match any website design - **Server-side security** that can't be bypassed by disabling JavaScript - **Zero configuration headaches** — edit one array and you're done

Whether you're building a contact form, login page, registration system, or comment section, CaptchaFun integrates in under 60 seconds.

Features

**CAPTCHA Types:** - ✅ Math CAPTCHA (configurable difficulty: easy/medium/hard) - ✅ Emoji CAPTCHA (fun tap-to-select challenges) - ✅ Color CAPTCHA (select the correct color circle) - ✅ Slider CAPTCHA (drag to complete) - ✅ Invisible Honeypot (catches bots silently) - ✅ Random mode (rotates types automatically)

**Security:** - ✅ Server-side validation (no client-side secrets) - ✅ HMAC-signed tokens (tamper-proof) - ✅ Single-use challenges (no replay attacks) - ✅ Rate limiting with configurable lockout - ✅ Minimum submission time (anti-speed-bot) - ✅ Challenge expiration (auto-cleanup) - ✅ Honeypot trap for basic bots - ✅ No personal data stored (GDPR/RGPD compliant)

**Design:** - ✅ 5 themes: Minimal, Colorful, Dark, Glass, Fun - ✅ Dark mode support - ✅ Fully responsive (mobile + desktop) - ✅ Smooth CSS animations - ✅ Beautiful hover/focus states - ✅ Modern rounded design

**Developer Experience:** - ✅ Single PHP file — no dependencies - ✅ 3-line integration (require, render, verify) - ✅ Multiple CAPTCHAs per page - ✅ AJAX refresh support - ✅ Custom JavaScript events - ✅ Works without JavaScript (graceful fallback) - ✅ PHP 8.1+ compatible - ✅ No database required - ✅ No admin panel needed - ✅ No external API keys - ✅ Well-documented source code

**Multilingual:** - ✅ Portuguese (PT) - ✅ English (EN) - ✅ Spanish (ES) - ✅ French (FR) - ✅ Easy to add more languages

Requirements

- PHP 8.1 or higher - PHP Sessions enabled - Any web server (Apache, Nginx, LiteSpeed, etc.) - Any shared hosting that supports PHP - No database required - No Composer required - No framework required

Instructions

Step 1: Upload captchafun.php to your project Step 2: Open the file and change 'secret_key' to a random string Step 3: In your form page, the include of the file