mPDF Manual – mPDF functions


(mPDF >= 2.3   <= 5.7)

SetAutoFont – Automatically detect language in the input HTML text and use appropriate fonts


void SetAutoFont ( int $flag )

Turns on the AutoFont function, which automatically detects language in the input HTML text and uses appropriate fonts.

AutoFont uses &lt;span lang="" class="lang_xx"&gt;...&lt;/span&gt; to mark text which is auto-detected. See lang for further details, but note that SetAutoFont also:

  • disables support for text-align=justify
  • sets $useLang=TRUE
  • sets $biDirectional=TRUE (if AUTOFONT_RTL is set)



This parameter specifies which languages are auto-detected. Either an integer or one of the defined constants can be used.

SetAutoFont(0) will turn off any auto-detection. Bitwise operators can be used with the defined constants e.g.

SetAutoFont(AUTOFONT_CJK AUTOFONT_THAIVIET) will turn on autodetection for CJK languages and Thai and Vietnamese.


AUTOFONT_CJK = 1 = Any CJK languages (Chinese - Japanese - Korean)

AUTOFONT_THAIVIET = 2 = Thai and Vietnamese

AUTOFONT_RTL = 4 = RTL languages i.e. Hebrew and Arabic, including Pashto, Urdu etc.

AUTOFONT_INDIC = 8 = Indic languages such as Devanagari

AUTOFONT_ALL = 15 = All of the above



4.0 AutoFont marks up the `<span>` with `class="lang_xx"` as well as  `lang``="xx"`
2.3 Function was added.
2.3 Internal variable $pregRTLchars was altered for better detection of arabic/hebrew
6.0 Removed in favour of autoLangToFont


Example #1


// Require composer autoload
require_once __DIR__ . '/vendor/autoload.php';

$mpdf = new mPDF('utf-8');

$html = '

Most of this text is in English, but has occasional words in Chinese:其貢獻在 or Vietnamese: Một khảo sát mới cho biết, or maybe even Arabic: البرادعی

البرادعی -12- البرادعی







See Also

  • useLang - Specify whether to recognise and support the HTML attribute lang
  • autoFontGroupSize - Specify the text chunk size to group when autodetecting text language
  • disableMultilingualJustify - Specify whether to disable text justification in multilingual documents
  • lang - Information on mPDF support for the HTML attribute lang