FPDF FPDI How to import a page from different FPDF class?

Question

I have a class that creates a FPDF document. And I would like to include that document in a different FPDF class.

    // Document/Class 1
    $pdf->new MyFirstDocument();
    $pdf->output

    // Document/Class 2
    class MySecondDocument extends FPDF {

    $this->addPage() //etc

    //and from here i would like to call the 
    //class MyFirstDocument and import the output 
    //into MySecondDocument as an additional page

    }

Answer 1

You wrote:

I have a class that creates a FPDF document. And I would like to include that document in a different FPDF class.

This is wrong! You can not have after $pdf->Output() anything output more, because $pdf->Output() creates a PDF document. You have to use it only one time per PDF document. Please read the documentation.

You can not have a second instance from FPDF too. Because of this you have to have in first class a constructer with instance from FPDF as parameter.

Solution example:

Because of all this we can not really import page from different FPDF class with FPDF, but we could do some like follows.

Code from firstpdf_class.php:

<?php 
class FirstPDF_Class
{
    private $fpdf_instance;

    function __construct($fpdf_instance)
    {
        $this->fpdf_instance = $fpdf_instance;
    }

    function print_title($doc_title, $company)
    { 
        $this->fpdf_instance->SetFont('Helvetica','B', 18);
        $this->fpdf_instance->Cell(210,4, $company, 0, 0, 'C'); 

        $this->fpdf_instance->Ln(); 
        $this->fpdf_instance->Ln(); 
        $this->fpdf_instance->Cell(37); 

        $this->fpdf_instance->SetFillColor(209, 204, 244); 
        $this->fpdf_instance->SetFont('Helvetica', 'B', 11);
        $this->fpdf_instance->Cell(150,8, $doc_title, 0, 0, 'C', 1);
    }
}
?>

Code from secondpdf_class.php:

<?php
require('fpdf.php');
require('firstpdf_class.php');

class SecondPDF_Class extends FPDF
{
    private $printpdf;

    function __construct($orientation = 'P', $unit = 'mm', $size = 'A4')
    {
        parent::__construct($orientation, $unit, $size);

        $this->printpdf = new FirstPDF_Class($this);

        $this->import_page('Document 1', 'Company "Fruits Sell"');
        $this->import_page('Document 2', 'Company "Boot Sell"');
    }

    public function import_page($doc_title, $company)
    {
        $this->AddPage();
        $this->printpdf->print_title($doc_title, $company);
    }

    function Footer()
    {
        $this->SetXY(100, -15);
        $this->SetFont('Helvetica','I', 10);
        $this->SetTextColor(128, 128,128);
        // Page number
        $this->Cell(0, 10,'This is the footer. Page '.$this->PageNo(),0,0,'C');
    }
}

$pdf = new SecondPDF_Class();
//not really import page, but some like this
$pdf->import_page('Document 3', 'Company "Auto Sell"');

$pdf->AddPage();
$pdf->SetFont('Helvetica','B', 18);
$pdf->Cell(210,4, 'Page 3.', 0, 0, 'C');
$pdf->Output();
?>