Unlike simple database lookups, this uses public/private key cryptography. Even if a user hacks your client-side code, they cannot generate a valid license file without your private key.
CREATE TABLE licenses ( id INT PRIMARY KEY AUTO_INCREMENT, license_key VARCHAR(255) NOT NULL, user_name VARCHAR(255) NOT NULL, email VARCHAR(255) NOT NULL, expiration_date DATE NOT NULL );
When a client application checks for updates, your licensing server verifies their key. If valid, the server uses a GitHub Personal Access Token (PAT) or GitHub App connection to securely stream the release ZIP file from the private GitHub repository down to the client's server. Conclusion php license key system github
Many repositories serve as educational code—demonstrating how to generate a 32-character key using random_bytes() and hash_hmac('sha256', ...) , or how to implement a simple domain-locking mechanism. These are not production-ready but are invaluable for learning.
try $pdo = new PDO($dsn, $username, $password); $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); Unlike simple database lookups, this uses public/private key
To prevent key sharing, systems often link a license to a specific "machine fingerprint." This might include hardware IDs or unique server environments.
A license key system is a mechanism used to validate and manage software licenses. In the context of PHP, a license key system can be used to restrict access to software, plugins, or themes. GitHub is a popular platform for version control and collaboration, and many developers use it to host their PHP projects. In this review, we'll explore the concept of a PHP license key system on GitHub, its benefits, and some popular open-source implementations. If valid, the server uses a GitHub Personal
false, 'message' => 'Invalid request method.']); exit; $license_key = $_POST['license_key'] ?? ''; $domain = $_POST['domain'] ?? ''; if (empty($license_key) || empty($domain)) echo json_encode(['valid' => false, 'message' => 'Missing required parameters.']); exit; // Connect to your database $pdo = new PDO('mysql:host=localhost;dbname=license_db', 'username', 'password'); // Check if license exists and is active $stmt = $pdo->prepare("SELECT * FROM licenses WHERE license_key = ? AND status = 'active'"); $stmt->execute([$license_key]); $license = $stmt->fetch(); if (!$license) echo json_encode(['valid' => false, 'message' => 'Invalid or suspended license key.']); exit; // Check expiration date if ($license['expires_at'] && strtotime($license['expires_at']) < time()) echo json_encode(['valid' => false, 'message' => 'License has expired.']); exit; // Check current activations $stmt = $pdo->prepare("SELECT COUNT(*) FROM activations WHERE license_id = ?"); $stmt->execute([$license['id']]); $current_activations = $stmt->fetchColumn(); // Check if this domain is already activated $stmt = $pdo->prepare("SELECT * FROM activations WHERE license_id = ? AND domain = ?"); $stmt->execute([$license['id'], $domain]); $already_active = $stmt->fetch(); if (!$already_active) if ($current_activations >= $license['max_activations']) echo json_encode(['valid' => false, 'message' => 'Activation limit reached.']); exit; // Register new activation $stmt = $pdo->prepare("INSERT INTO activations (license_id, domain) VALUES (?, ?)"); $stmt->execute([$license['id'], $domain]); echo json_encode(['valid' => true, 'message' => 'License validated successfully.']); Use code with caution. Step 3: Implementing the Client-Side Verification