I have the code snippet below

  //create a new word document

    $word= new PHPWord();

    //create potrait orientation
    $section=$word->createSection();   


    $table = $section->addTable();
    $word->addFontStyle('rStyle', array('bold'=>true, 'italic'=>true, 'size'=>16));
    //header row
    $table->addRow(400, array('bgColor'=>'dbdbdb'));
    $table->addCell(2000, array('bgColor'=>'dbdbdb'))->addText('Cell 1','rStyle');
    $table->addCell(3500, array('bgColor'=>'dbdbdb'))->addText('Cell 1');
    $table->addCell(1500, array('bgColor'=>'dbdbdb'))->addText('Cell 1','rStyle');
    $table->addCell(2000, array('bgColor'=>'dbdbdb'))->addText('Cell 1');       

    // Save File
    $objWriter = PHPWord_IOFactory::createWriter($word, 'Word2007');
    $objWriter->save('Text.docx');
    echo 'Text.docx created successfully';
}

How can i add text formatting to a cell value to bold, italic, font-size etc, I have tried as shown above but it does not work