PHP Modernization with Autohand Code

# Analyze PHP 7 codebase
autohand analyze --language php --version 7.4 \
  --target-version 8.3 \
  --output php-analysis.json

# Analysis includes:
# - Deprecated function usage
# - Framework compatibility
# - Extension dependencies
# - Code complexity metrics

# Upgrade PHP 7.4 to 8.3
autohand upgrade-php --from 7.4 --to 8.3 \
  --apply-features \
  --fix-deprecated

# Key transformations:
# - Named parameters and union types
# - Match expressions and nullsafe operator
// - Attributes and enums
# - String interpolation improvements

// Before (PHP 7.4)
function getUserData($id) {
    $user = findUser($id);
    if ($user !== null) {
        return $user->getName();
    }
    return null;
}

// Before (PHP 7.4)
class User {
    private $name;
    private $email;
    
    public function __construct($name, $email) {
        $this->name = $name;
        $this->email = $email;
    }
    
    public function getName() { return $this->name; }
    public function getEmail() { return $this->email; }
}

// After (PHP 8.3)
function getUserData(int $id): ?string {
    return findUser($id)?->getName();
}

// After (PHP 8.3)
class User {
    public function __construct(
        private string $name,
        private string $email
    ) {}
    
    public function getName(): string { return $this->name; }
    public function getEmail(): string { return $this->email; }
}

# Migrate CodeIgniter to Laravel
autohand migrate-framework --from codeigniter --to laravel \
  --target-version 10 \
  --eloquent-orm

# Migrate legacy Symfony to modern Symfony
autohand migrate-framework --from symfony4 --to symfony6 \
  --auto-wiring \
  --php-attributes

// Before (CodeIgniter)
class Users extends CI_Controller {
    public function index() {
        $this->load->model('user_model');
        $data['users'] = $this->user_model->get_all();
        $this->load->view('users/index', $data);
    }
}

// After (Laravel)
class UsersController extends Controller {
    public function index(): View {
        $users = User::all();
        return view('users.index', compact('users'));
    }
}

// Before (Procedural)
function calculate_total($items) {
    $total = 0;
    foreach ($items as $item) {
        $total += $item['price'] * $item['quantity'];
    }
    return $total;
}

function apply_tax($total, $rate) {
    return $total * (1 + $rate);
}

// After (OOP)
class Order {
    private array $items;
    private float $taxRate;
    
    public function __construct(array $items, float $taxRate = 0.0) {
        $this->items = $items;
        $this->taxRate = $taxRate;
    }
    
    public function calculateSubtotal(): float {
        return array_reduce($this->items, fn($total, $item) => 
            $total + $item['price'] * $item['quantity'], 0.0);
    }
    
    public function calculateTotal(): float {
        return $this->calculateSubtotal() * (1 + $this->taxRate);
    }
}

// Before (Raw SQL)
function getUsers($limit = 10) {
    $conn = mysqli_connect('localhost', 'user', 'pass', 'db');
    $result = mysqli_query($conn, "SELECT * FROM users LIMIT $limit");
    $users = [];
    while ($row = mysqli_fetch_assoc($result)) {
        $users[] = $row;
    }
    return $users;
}

// After (Eloquent ORM)
class User extends Model {
    protected $fillable = ['name', 'email', 'created_at'];
    
    public function orders(): HasMany {
        return $this->hasMany(Order::class);
    }
    
    public function scopeActive(Builder $query): Builder {
        return $query->where('status', 'active');
    }
}

// Usage
$users = User::active()->limit(10)->get();

# Generate tests for legacy code
autohand generate-tests --language php \
  --target-version 8.3 \
  --test-framework pest

# Validate migration
autohand validate-migration --from 7.4 --to 8.3 \
  --run-tests \
  --performance-benchmark

# Compare behavior
autohand compare --before php7-output \
  --after php8-output \
  --tolerance 0.001

// Generated test (Pest PHP)
test('calculate_total works correctly', function () {
    $items = [
        ['price' => 10.0, 'quantity' => 2],
        ['price' => 5.0, 'quantity' => 3]
    ];
    
    $order = new Order($items, 0.1);
    
    expect($order->calculateSubtotal())->toBe(35.0);
    expect($order->calculateTotal())->toBe(38.5);
});

# Apply security updates
autohard security-update --language php \
  --target-version 8.3 \
  --fix-vulnerabilities

# Key security improvements:
# - Input validation and sanitization
# - SQL injection prevention
# - XSS protection
# - CSRF token implementation
# - Password hashing updates

// Before (Insecure)
$password = $_POST['password'];
$sql = "SELECT * FROM users WHERE email = '$email'";
$result = mysqli_query($conn, $sql);

// After (Secure)
$password = password_hash($_POST['password'], PASSWORD_DEFAULT);
$stmt = $pdo->prepare("SELECT * FROM users WHERE email = :email");
$stmt->execute(['email' => $email]);

# Modernize API endpoints
autohand modernize-api --from rest-v1 --to rest-v2 \
  --openapi-spec \
  --validation-rules

# Generate API documentation
autohand generate-docs --format openapi \
  --include-examples