Default font (used by PDF library) doesn't support all UTF8 symbols.
So if you use Chinese,Arabic,Cyrillic,Hebrew  -- you must install new font.


Please, use this way.


1. dowload zip from https://freefontsdownload.net/free-st-gigafont-typefacescode2003-font-152444.htm

2. run ftp client and create folder "fonts" inside active theme

3. upload file Code200365k.ttf to folder "fonts".

4. add following PHP code to functions.php





add_filter("woe_formatter_pdf_use_external_font","__return_true");
add_filter("woe_formatter_pdf_apply_external_font",function($fpdf){
    $fpdf->setFontPath( dirname( __FILE__ ) ."/fonts/"); 
    $fpdf->AddFont( 'Code200365k', "", "Code200365k.ttf" );
    $fpdf->AddFont( 'Code200365k', "B", "Code200365k.ttf" );
    $fpdf->SetFont( 'Code200365k', '', 12 );
    return $fpdf;
});