What is the significance of defining FPDF_FONTPATH and how does it relate to the font directory?

Defining FPDF_FONTPATH is significant because it allows FPDF to locate the directory where font files are stored. This is necessary for FPDF to properly load and use custom fonts in PDF documents. By setting FPDF_FONTPATH to the correct directory path, FPDF can access the necessary font files and ensure that the fonts are displayed correctly in the generated PDFs.

define('FPDF_FONTPATH','/path/to/fonts/directory/');