Are there any specific troubleshooting steps or common mistakes to avoid when working with FPDF and font definitions in PHP?

When working with FPDF and font definitions in PHP, a common mistake is not properly defining the font before using it in the PDF document. To troubleshoot this issue, make sure to include the font definition at the beginning of the script using the AddFont() method provided by FPDF.

// Include the FPDF library
require('fpdf.php');

// Define the font using AddFont() method
$pdf = new FPDF();
$pdf->AddFont('Arial', '', 'arial.php');

// Use the font in the PDF document
$pdf->SetFont('Arial', '', 12);
$pdf->Cell(0, 10, 'Hello World', 0, 1, 'C');

$pdf->Output();