require_once 'path/to/library-open/src/CryptNote.php';
require_once 'path/to/library-open/src/CryptNoteStandalone.php';

<?php
use CryptNote\CryptNote;

// Initialize with default settings
$cryptnote = new CryptNote();

// Create an encrypted note
$result = $cryptnote->create('This is a secret message!', [
    'max_views' => 1,  // Self-destruct after 1 view
]);

echo "Token: " . $result['token'];
// Token: a1b2c3d4e5f6...

// View the note (this will decrement the view count)
$note = $cryptnote->view($result['token']);
echo $note['content'];
// Output: This is a secret message!

// The note is now destroyed (max_views reached)

<?php
use CryptNote\CryptNote;

$cryptnote = new CryptNote();

// Create a password-protected note
$result = $cryptnote->create('Top secret information', [
    'password' => 'mySecretPassword123',
    'max_views' => 3,
]);

// View requires the password
$note = $cryptnote->view($result['token'], 'mySecretPassword123');
echo $note['content'];

<?php
use CryptNote\CryptNote;

$cryptnote = new CryptNote();

// Create a note that expires in 60 minutes
$result = $cryptnote->create('Time-sensitive information', [
    'max_views' => 10,
    'expire_minutes' => 60,  // Expires in 1 hour
]);

echo "Expires at: " . $result['expires_at'];

<?php
use CryptNote\CryptNote;

$cryptnote = new CryptNote();

$status = $cryptnote->status($token);

if ($status['status'] === 'active') {
    echo "Note is active";
    echo "Remaining views: " . $status['remaining_views'];
    echo "Requires password: " . ($status['requires_password'] ? 'Yes' : 'No');
} elseif ($status['status'] === 'expired') {
    echo "Note has expired";
} else {
    echo "Note not found";
}

<?php
use CryptNote\CryptNoteStandalone;

$crypto = new CryptNoteStandalone();

// Generate a key
$key = $crypto->generateKey();

// Encrypt
$encrypted = $crypto->encrypt('My secret data', $key);

// Decrypt
$decrypted = $crypto->decrypt($encrypted, $key);

// With password
$encrypted = $crypto->encryptWithPassword('My secret', $key, 'password123');
$decrypted = $crypto->decryptWithPassword($encrypted, $key, 'password123');

$cryptnote = new CryptNote([
    // Database path (default: ./data/cryptnote.db)
    'db_path' => '/path/to/your/database.db',
    
    // Encryption method (default: AES-256-CBC)
    'encryption_method' => 'AES-256-CBC',
    
    // Token length in bytes (default: 32, produces 64 hex chars)
    'token_length' => 32,
    
    // Maximum content length (default: 50000)
    'max_content_length' => 50000,
    
    // PBKDF2 iterations for password derivation (default: 100000)
    'pbkdf2_iterations' => 100000,
    
    // Enable automatic cleanup (default: true)
    'auto_cleanup' => true,
    
    // Days after which unviewed notes are cleaned (default: 15)
    'cleanup_days' => 15,
    
    // Base URL for generating share links (optional)
    'base_url' => 'https://yoursite.com/view',
]);

$crypto = new CryptNoteStandalone([
    'encryption_method' => 'AES-256-CBC',
    'pbkdf2_iterations' => 100000,
]);

[
    'success' => true,
    'token' => 'abc123...',
    'has_password' => false,
    'max_views' => 1,
    'is_markdown' => false,
    'is_html' => false,
    'expires_at' => '2026-01-15 12:00:00',
    'created_at' => '2026-01-15 11:00:00',
    'share_url' => 'https://yoursite.com/view?token=abc123...',  // if base_url configured
]

[
    'success' => true,
    'content' => 'The decrypted message',
    'is_markdown' => false,
    'is_html' => false,
    'remaining_views' => 0,
    'max_views' => 1,
    'expires_at' => null,
    'destroyed' => true,
]

[
    'success' => true,
    'status' => 'active',  // 'active', 'expired', 'not_found', 'invalid_token'
    'requires_password' => false,
    'is_markdown' => false,
    'is_html' => false,
    'max_views' => 3,
    'remaining_views' => 2,
    'expires_at' => null,
    'created_at' => '2026-01-15 11:00:00',
]

<?php
// create.php
use CryptNote\CryptNote;

$cryptnote = new CryptNote([
    'base_url' => 'https://yoursite.com/view.php',
]);

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $result = $cryptnote->create($_POST['content'], [
        'password' => $_POST['password'] ?: null,
        'max_views' => (int)$_POST['max_views'],
        'expire_minutes' => $_POST['expire_minutes'] ?: null,
    ]);
    
    echo "Share this link: " . $result['share_url'];
}

<?php
// view.php
use CryptNote\CryptNote;

$cryptnote = new CryptNote();
$token = $_GET['token'] ?? '';

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    try {
        $note = $cryptnote->view($token, $_POST['password'] ?? null);
        echo htmlspecialchars($note['content']);
    } catch (Exception $e) {
        echo "Error: " . $e->getMessage();
    }
}