PHP 7 FPDI Library Example to Edit or Modify Existing PDF Document and Add Text inside it in Browser
index.php
<?php
use setasign\Fpdi\Fpdi;
require_once('fpdf/fpdf.php');
require_once('fpdi2/src/autoload.php');
// initiate FPDI
$pdf = new Fpdi();
// add a page
$pdf->AddPage();
// set the source file
$pdf->setSourceFile('PdfDocument.pdf');
// import page 1
$tplIdx = $pdf->importPage(1);
// use the imported page and place it at position 10,10 with a width of 100 mm
$pdf->useTemplate($tplIdx, 10, 10, 100);
// now write some text above the imported page
$pdf->SetFont('Helvetica');
$pdf->SetTextColor(255, 0, 0);
$pdf->SetXY(30, 30);
$pdf->Write(0, 'This is just a simple text');
$pdf->Output('I', 'generated.pdf');