How to disable Ligatures/Diacritics functionality in mpdf?-CodePudding

I generate PDFs with MPDF 8.1.1. These PDF include email addresses. But it looks like the "Combining Diacritics" functionality or the "Ligatures" of the font rendering destroys some of them. I provide UTF8 encoded text.

For example, if the address contains ffl, it replaces this by a glyph ﬄ and turns the email address invalid.

I tried to instantiate mPDF with allow_charset_conversion=false like this

$pdf = new Mpdf\Mpdf([
  'PDFA' => true,
  'PDFAauto' => true,
  'allow_charset_conversion' => false
]);

But it continues to destroy emails.

What is the correct way to disable that "Combining Diacritics" functionality or "Ligatures" replacement?

CodePudding user response：

The mPDF documentation gives this CSS style to disable ligatures:

/* disable common ligatures, usually on by default */
.noligs { font-feature-settings: "liga" 0; }

Alternatively you can use 'useOTL' => 0 to disable all OTL features on a font.