How can developers efficiently migrate from using FPDF to a more modern PDF library like TCPDF or ZendPdf in existing PHP projects without causing significant disruption?

To efficiently migrate from using FPDF to a more modern PDF library like TCPDF or ZendPdf in existing PHP projects without causing significant disruption, developers can create wrapper classes that mimic the FPDF interface but internally use the new library's functionalities. This way, the existing codebase can continue to work seamlessly with minimal changes, while gradually transitioning to the new library's features.

// FPDF Wrapper Class
class PDF {
    private $pdf;

    public function __construct() {
        // Initialize TCPDF or ZendPdf instance
        $this->pdf = new TCPDF(); // or new ZendPdf()
    }

    public function AddPage() {
        $this->pdf->AddPage();
    }

    // Add more wrapper functions as needed to mimic FPDF's interface
}

// Usage in existing code
$pdf = new PDF();
$pdf->AddPage();
$pdf->SetFont('Arial', 'B', 16);
$pdf->Cell(40, 10, 'Hello, World!');
$pdf->Output();