在TCPDF中包含frutiger字体样式

I am generating the PDF using TCPDF. The output I get is in Helvetica font but I want it in Frutiger. I have a frutiger.otf file.

I tried the following code

$fontname = $pdf->addTTFfont('Frutiger-45Light.otf', 'TrueTypeUnicode', '', 32);
$pdf->SetFont($fontname);

I am getting an error: could not include font definition file. And I have googled many websites which didn't help.

You cannot use a URL as fontfile. It must be a path in the local filesystem.

If you need a font on a different server you first must download it yourself. Since fonts are static you should do this manually.