Some kanji characters cannot be displayed

[thinh1995]

I am using TCPDF latest version (6.7.5) to export PDF documents. In the document there are some Japanese kanji characters that cannot be displayed, but other characters is OK. I have tried using fonts like cid0jp, cid0cs, cid0cs, arialuni, ... but it still doesn't work. I also download Japanese fonts and add them to the library but the result is still the same. Below is the demo.php file and the result is an empty pdf file:

<?php 
require_once('tcpdf/tcpdf.php');

$pdf = new TCPDF('P', 'mm', 'A4', true, 'UTF-8', false);

$pdf->setPrintHeader(false);
$pdf->setPrintFooter(false);

$pdf->AddPage();

$string = "𠀋 𡈽 𡌛 𡑮 𡢽 𠮟 𡚴 𡸴 𣇄 𣗄";
$pdf->SetFont('cid0jp', '', 12);
$pdf->Cell(190, 10, $string, 0, 11);

$pdf->Output();

I researched and found that 4-byte kanji characters cannot be displayed. List of 4-byte characters on this page cannot be displayed:
https://ah-2.com/g1/2015/09/18/sjis2004_utf8_4byte_chars.html

Please give me some solutions or some examples for my case. Thanks a lot.

[ren1244]

I tested several libraries (dompdf, mpdf, tcpdf), and only mpdf supports Unicode beyond 0xFFFF.

The versions of the libraries tested are as follows:

• tecnickcom/tcpdf: 6.7.5
• dompdf/dompdf: 2.0.8
• mpdf/mpdf: 8.2.3