What are common issues when trying to fill a PDF form using PHP scripts?

One common issue when trying to fill a PDF form using PHP scripts is that the form fields may not be properly identified or accessible through the script. To solve this issue, you can use a library like TCPDF or FPDF to programmatically fill in the form fields with the desired data.

require('fpdf.php');

$pdf = new FPDF();
$pdf->AddPage();

$pdf->SetFont('Arial','B',16);
$pdf->Cell(40,10,'Hello World!');

$pdf->Output();