Linker::link() and Linker::linkKnown() functions are deprecated as of MediaWiki 1.28, and the new LinkRenderer is preferred instead.
https://doc.wikimedia.org/mediawiki-core/master/php/classLinker.html
./DocBookExport/DocBookExport.php: $docbook_link = Linker::linkKnown( Title::makeTitle(NS_SPECIAL, 'GetDocbook'), "Get Docbook - " . $book_name, [], [ 'embed_page' => $parser->getTitle()->getText(), 'bookname' => $book_name ] ); ./DocBookExport/DocBookExport.php: return Linker::linkKnown( Title::newFromText( $pagename ), $pagename ); ./DocBookExport/SpecialGetDocbook.php: $check_status_link = Linker::linkKnown( Title::makeTitle(NS_SPECIAL, 'GetDocbook'), "Check Status", [], [ 'embed_page' => $this->embed_page, 'bookname' => $this->bookname, 'action' => 'check_status' ] ); ./DocBookExport/SpecialGetDocbook.php: $check_status_link = Linker::linkKnown( Title::makeTitle(NS_SPECIAL, 'GetDocbook'), "Refresh Status", [], [ 'embed_page' => $this->embed_page, 'bookname' => $this->bookname, 'action' => 'check_status' ] ); ./DocBookExport/SpecialGetDocbook.php: $create_link = Linker::linkKnown( Title::makeTitle(NS_SPECIAL, 'GetDocbook'), "Re-generate Docbook", ['id' => "create_docbook"], [ 'embed_page' => $this->embed_page, 'bookname' => $this->bookname, 'action' => 'create' ] );