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Super. Thank you!!!

It happened here and so

// footnote
    $footnote = new WordFragment($docx, 'document');
    $footnote->addFootnote(
      array(
        'textDocument' => 'footnote',
        'textFootnote' => 'The footnote we want to insert.',
      )
    );
    
    // table
    $textFragment = new WordFragment($docx);
    $text = array();
    $text[] = $footnote;

    $paragraphOptions = array(
      'textAlign' => 'center',
    );
    $textFragment->addText($text, $paragraphOptions);
    $valuesTable = array(
      array(
        $textFragment,
      ),
      array(
        '2',
      ),
      array(
        '3',
      ),
    );

    $docx->addTable($valuesTable);