Php License Key System Github

php-license-key-system/ ├── api/ │ ├── generate.php │ ├── validate.php │ └── status.php ├── database/ │ └── license.sql ├── includes/ │ ├── config.php │ └── License.php ├── examples/ │ ├── client-example.php │ └── admin-generate.php └── README.md

## Installation

git clone https://github.com/yourusername/php-license-key-system.git
</code></pre>
<ol start="2">
<li>
<p>Import <code>database/license.sql</code> into your MySQL database.</p>
</li>
<li>
<p>Update <code>includes/config.php</code> with your database credentials.</p>
</li>
</ol>
<h2>Database Schema</h2>
<pre><code class="language-sql">CREATE TABLE `licenses` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `license_key` varchar(64) NOT NULL,
  `product_id` int(11) DEFAULT 1,
  `customer_email` varchar(255) DEFAULT NULL,
  `domain` varchar(255) DEFAULT NULL,
  `expires_on` date DEFAULT NULL,
  `status` enum('active','expired','blocked') DEFAULT 'active',
  `created_at` timestamp NOT NULL DEFAULT current_timestamp(),
  PRIMARY KEY (`id`),
  UNIQUE KEY `license_key` (`license_key`)
);
</code></pre>
<h2>API Usage</h2>
<h3>Generate License</h3>
<pre><code>POST /api/generate.php
</code></pre>
<p>Params: <code>product_id</code>, <code>customer_email</code>, <code>expires_days</code>, <code>domain</code></p>
<h3>Validate License</h3>
<pre><code>GET /api/validate.php?license_key=XXXX&domain=example.com
</code></pre>
<p>Response: <code> valid: true, message: "License is active", expires_on: "2025-12-31" </code></p>
<h2>Example Client Code</h2>
<pre><code class="language-php"><?php
$licenseKey = "USER_INPUT_KEY";
$domain = $_SERVER['HTTP_HOST'];
$response = file_get_contents("https://your-server.com/api/validate.php?license_key=$licenseKey&domain=$domain");
$data = json_decode($response, true);
if ($data['valid']) 
    echo "✅ License valid until " . $data['expires_on'];
 else 
    echo "❌ " . $data['message'];
?>
</code></pre>
<h2>Security Notes</h2>
<ul>
<li>Always validate licenses server-side.</li>
<li>Use HTTPS for API calls.</li>
<li>Hash license keys before storing in DB (we provide <code>hash_hmac</code> example).</li>
<li>Optionally implement IP whitelisting.</li>
</ul>
<h2>License</h2>
<p>MIT – Use freely for personal/commercial projects.</p>
<pre><code>
---
## 🔧 Core PHP Files
### `includes/config.php`
```php
<?php
define('DB_HOST', 'localhost');
define('DB_NAME', 'license_db');
define('DB_USER', 'root');
define('DB_PASS', '');
define('SECRET_KEY', 'your-strong-secret-key-here'); // used for hashing
try 
    $pdo = new PDO("mysql:host=" . DB_HOST . ";dbname=" . DB_NAME, DB_USER, DB_PASS);
    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
 catch(PDOException $e) 
    die("Database connection failed: " . $e->getMessage());
?>
</code></pre>
<h3><code>includes/License.php</code></h3>
<pre><code class="language-php"><?php
class License 
    private $db;
public function __construct($pdo) 
        $this->db = $pdo;
public function generate($productId, $email, $expiresDays, $domain = null) 
        $licenseKey = bin2hex(random_bytes(16)) . '-' . strtoupper(bin2hex(random_bytes(4)));
        $expiresOn = date('Y-m-d', strtotime("+$expiresDays days"));
$stmt = $this->db->prepare("INSERT INTO licenses (license_key, product_id, customer_email, domain, expires_on) VALUES (?, ?, ?, ?, ?)");
        $stmt->execute([$licenseKey, $productId, $email, $domain, $expiresOn]);
return ['license_key' => $licenseKey, 'expires_on' => $expiresOn];
public function validate($licenseKey, $domain = null) 
        $stmt = $this->db->prepare("SELECT * FROM licenses WHERE license_key = ?");
        $stmt->execute([$licenseKey]);
        $license = $stmt->fetch(PDO::FETCH_ASSOC);
if (!$license) 
            return ['valid' => false, 'message' => 'License key not found'];
if ($license['status'] === 'blocked') 
            return ['valid' => false, 'message' => 'License key blocked'];
if ($license['expires_on'] < date('Y-m-d')) 
            return ['valid' => false, 'message' => 'License expired'];
if ($license['domain'] && $license['domain'] !== $domain) 
            return ['valid' => false, 'message' => 'Invalid domain for this license'];
return [
            'valid' => true,
            'message' => 'License is active',
            'expires_on' => $license['expires_on']
        ];
?>
</code></pre>
<h3><code>api/generate.php</code></h3>
<pre><code class="language-php"><?php
require_once '../includes/config.php';
require_once '../includes/License.php';
header('Content-Type: application/json');
if ($_SERVER['REQUEST_METHOD'] !== 'POST') 
    http_response_code(405);
    echo json_encode(['error' => 'Method not allowed']);
    exit;
$productId = $_POST['product_id'] ?? 1;
$email = $_POST['customer_email'] ?? null;
$expiresDays = $_POST['expires_days'] ?? 365;
$domain = $_POST['domain'] ?? null;
$licenseSys = new License($pdo);
$result = $licenseSys->generate($productId, $email, $expiresDays, $domain);
echo json_encode(['success' => true, 'data' => $result]);
?>
</code></pre>
<h3><code>api/validate.php</code></h3>
<pre><code class="language-php"><?php
require_once '../includes/config.php';
require_once '../includes/License.php';
header('Content-Type: application/json');
$licenseKey = $_GET['license_key'] ?? null;
$domain = $_GET['domain'] ?? null;
if (!$licenseKey) 
    echo json_encode(['valid' => false, 'message' => 'License key required']);
    exit;
$licenseSys = new License($pdo);
$result = $licenseSys->validate($licenseKey, $domain);
echo json_encode($result);
?>
</code></pre>
<hr>
<h2>✅ Next Steps for Your GitHub Repo</h2>
<ol>
<li>Create the repo: <code>php-license-key-system</code></li>
<li>Add the files above</li>
<li>Push to GitHub</li>
<li>Add a <code>LICENSE</code> file (MIT)</li>
<li>Optional: Add a demo GIF or badge for PHP version</li>
</ol>

The open-source nature of PHP makes it a favorite for web developers, but it presents a unique challenge for those looking to sell premium plugins, themes, or SaaS boilerplate: code visibility. Unlike compiled languages, PHP source code is easily readable, making license enforcement tricky.
Searching for a "PHP license key system" on GitHub reveals a spectrum of solutions, from simple scripts to robust API-driven frameworks. Here is a comprehensive guide on how these systems work, what to look for on GitHub, and how to implement one securely. Why Use a PHP License System? A licensing system serves three main purposes:
Revenue Protection: Ensures only paying customers can access updates or premium features.
Usage Monitoring: Tracks how many domains or "seats" are using a single key.
Remote Control: Allows you to revoke access if a refund is issued or a subscription expires. Core Components of a GitHub-Based License System
Most reputable repositories on GitHub follow a "Client-Server" architecture: 1. The Licensing Server
This is a central dashboard where you manage products and keys.
Key Generation: Creates unique strings (e.g., ABCD-1234-EFGH).
Validation API: An endpoint that receives a license key and a domain name, then returns a JSON response (Valid/Invalid/Expired). 2. The Client-Side Wrapper This is the code you bundle with your PHP product.
The "Call Home" Mechanism: Periodically sends the user's license key to your server via cURL.
Activation Logic: On the first run, the user enters a key; the script verifies it and saves an encrypted token locally to prevent constant API calls. Top Features to Look for in GitHub Repositories
When browsing GitHub for "PHP license key system," look for these essential features:
Domain Locking: Ensures a key meant for one site isn't used on a thousand sites.
Hardware ID (HWID) Tracking: For CLI or desktop-based PHP apps, this locks the license to a specific machine.
Expiration Logic: Support for lifetime, annual, or trial licenses.
Obfuscation Compatibility: Since PHP is plain text, seasoned developers often use tools like IonCube or Yakpro alongside their license system to hide the "check" logic from users. Popular GitHub Project Archetypes
The "Software Manager" (Full Suite): These are large projects that include a full admin panel (built with Laravel or Slim) to manage users and keys. php license key system github
The "WordPress Focused" Library: Many GitHub repos are specifically designed as "Update Checkers" for WordPress, mimicking the functionality of Easy Digital Downloads (EDD) or WooCommerce Software Add-on.
The Simple Script: A single License.php class. Great for learning, but often easy for a savvy user to "null" (bypass). How to Implement a Basic System (Step-by-Step)
If you find a library you like on GitHub, the implementation usually looks like this:
Step 1: Hosting the ServerDeploy the server-side code from the repository to your own private domain (e.g., ://yourbrand.com).
Step 2: Integrating the ClientInclude the client library in your plugin:
require_once 'src/LicenseManager.php'; $license = new LicenseManager('YOUR_API_KEY'); if (!$license->isValid($_POST['user_key']))  die("Invalid License. Please purchase one at yourbrand.com.");   Use code with caution.
Step 3: Security HardeningNever rely on a simple true/false check. Better systems use Public/Private Key Encryption (RSA). The server signs the response with a private key, and your product verifies that signature with a public key. This prevents users from "faking" a successful response by editing their local hosts file. The Limitations of PHP Licensing
It is important to remember that no PHP license system is 100% uncrackable. Because the user has the source code, a determined developer can always find the line of code that says if ($isValid) and change it to if (true).
To combat this, professional developers focus on value-added licensing: making the license key the gatekeeper for automatic updates, cloud-based data, or premium support—things a "nulled" version can't provide. Conclusion
GitHub is an excellent resource for finding PHP license key systems, whether you need a lightweight script or a professional-grade API. By choosing a system that supports domain locking and encrypted communication, you can effectively monetize your PHP projects while maintaining a seamless experience for your users.
Building a license key system in PHP is a common challenge for developers wanting to protect their commercial scripts, WordPress plugins, or SaaS tools. On GitHub, you can find a range of solutions from simple key generators to full-featured license servers. 1. Popular PHP Licensing Projects on GitHub
Depending on your needs, these open-source repositories offer different levels of complexity:
PHP-License-Key-Generator (SunLicense): A straightforward class for creating unique, formatted license keys (e.g., AA9A9A-AA-99).
PHP-based Software License Server: A robust, high-performance server system for managing products, versions, and licenses. It includes an SDK and CLI tools.
f-license: An easy-to-integrate tool for license creation and verification designed for developers who want to avoid building a custom system from scratch.
Laravel-Licensing: A modern package using PASETO v4 tokens with Ed25519 signatures for offline verification and seat-based licensing. 2. Core Mechanics of a Licensing System
A typical system involves three main stages: generation, activation, and validation.
Generation: Keys are created upon purchase, often using random alphanumeric strings or encrypted payloads containing user data. ## Installation
Activation: When the user installs your software, it sends a "fingerprint" (unique hardware or domain identifier) and the license key to your server.
Validation: The software periodically "calls home" or uses public-key encryption (RSA/OpenSSL) to verify the license is still active and assigned to that specific environment. 3. Security Best Practices
Technical protection in PHP is difficult because the source code is readable. To improve security: PHP-based Software License Server - GitHub
Building a license key system in PHP involves creating a secure way to generate, validate, and manage access to your software. GitHub hosts several repositories that provide foundations for these systems, ranging from simple key generators to full server-client architectures. Popular GitHub Repositories for PHP Licensing
These open-source tools can help you get started without building a system from scratch:
SunLicense: A simple PHP class for generating random, unique license keys with custom prefixes and templates (e.g., PREFIX-AA99-AA99).
LicenseKeys: A comprehensive Laravel-based application designed to manage application licenses.
PHP License Server: A high-performance server system for managing products, versions, and encrypted serial numbers.
Keygen Example PHP Server: An example of how to implement machine activation using device fingerprints. Core Components of a Licensing System A robust system typically requires two main parts:
Server Node: The central hub (often a Web API) that stores valid keys in a database (like MySQL) and handles activation requests.
Client Node: The code integrated into your software that communicates with the server to verify the license key. Implementation Best Practices php license key management software - GitHub
To implement a PHP license key system, you can use existing GitHub projects to handle key generation, server-side management, or client-side activation. 1. Key Generation Libraries
For creating unique and secure license keys, these lightweight libraries offer customizable formats:
PHP-License-Key-Generator: A simple class for creating random, unique keys with user-defined prefixes and templates (e.g., AA9A9A-AA-99).
Keygen-PHP: A fluent random key generator that can produce numeric, alphanumeric, or custom-sequenced keys.
PHP-License: Uses RSA key pairs (public/private keys) to generate and parse cryptographically signed licenses, ensuring they cannot be easily forged. 2. Full License Management Systems
If you need a complete backend to manage users, activations, and expirations, consider these open-source frameworks:
LicenseKeys: A Laravel-based application that provides a full dashboard for developers to manage application licenses without building a system from scratch. git clone https://github
LicenseGuard: A comprehensive management tool that includes an admin panel, email verification, and cron job support for automated tasks.
Laravel-Licensing: An enterprise-grade package supporting seat-based limits, offline verification via PASETO tokens, and full audit trails. 3. Remote Activation Examples For projects that require "calling home" to verify a key:
Keygen.sh PHP Example: Demonstrates how to build an activation server that handles machine fingerprints and license validation.
KeyAuth PHP Example: Provides a ready-to-use client-side integration for the KeyAuth authentication system, including registration and login via license keys. Implementation Workflow
Implementing a PHP license key system involves using server-side validation to manage key generation, activation with hardware ID (HWID) locking, and validation. Top GitHub solutions include KeyAuth for comprehensive management, Laravel Licensing for offline verification, and Keygen.sh for secure, machine-fingerprinted activations. For more details, explore the Keygen.sh example repository masterix21/laravel-licensing - GitHub
A PHP License Key System allows developers to distribute PHP applications (WordPress plugins, SaaS scripts, or standalone PHP apps) while restricting usage to authorized users. GitHub hosts numerous solutions ranging from simple "key generators" to full-fledged licensing servers.
This report finds that while many repositories exist, most are unmaintained or lack security hardening. For a "proper" implementation, developers should look for systems that implement RSA Signing (Asymmetric Encryption) rather than simple string matching, and separate the licensing server from the distributed application.

function validateKey($userKey) 
    // Fetch from your database
    $validKey = "ABCD-1234-EFGH-5678";
    $expires = "2025-12-31";
if($userKey === $validKey && strtotime($expires) > time()) 
    return true;
return false;


if(!validateKey($_POST['license_key'])) 
die("Invalid or expired license.");

Important: Never hardcode keys like this. Always query your database.
Before integrating any GitHub-sourced license system, a developer must watch for:
A naive system checks $_POST['key'] == DB('key'). A hacker can simply modify your PHP code to return true;. Solution: Use IonCube encoding, or better, offload critical logic to the remote server (e.g., don't just check a flag; fetch actual data from the server).
Create api/validate.php on your server.
<?php
header('Content-Type: application/json');
$input = json_decode(file_get_contents('php://input'), true);
$licenseKey = $input['license_key'] ?? '';
$domain = $_SERVER['HTTP_HOST']; // Basic domain binding
// Query DB
$stmt = $pdo->prepare("SELECT * FROM licenses WHERE license_key = ?");
$stmt->execute([$licenseKey]);
$license = $stmt->fetch();
if (!$license) 
echo json_encode(['valid' => false, 'reason' => 'Key not found']);
exit;

if ($license['status'] !== 'valid') 
echo json_encode(['valid' => false, 'reason' => 'License ' . $license['status']]);
exit;

// Check expiry
if (new DateTime($license['expires_at']) < new DateTime()) 
echo json_encode(['valid' => false, 'reason' => 'Expired']);
exit;

echo json_encode(['valid' => true, 'tier' => 'premium']);