<?php

add_filter( 'woocommerce_product_tabs', 'woo_new_product_tab' );
function woo_new_product_tab( $tabs ) {
  if(get_field('szerokosc') || get_field('wysokosc') || get_field('glebokosc') || get_field('dlugosc') || get_field('fieldname')) {
    // Adds the new tab

    $tabs['test_tab'] = array(
        'title'     => __( 'Additional information', 'woocommerce' ),
        'priority'  => 50,
        'callback'  => 'woo_new_product_tab_content'
    );
  }
    return $tabs;
}
function woo_new_product_tab_content() {
    // The new tab content
?>
<table id="tab-product">
    <?php if(get_field('szerokosc')): echo'<tr><td class="wymiary-left"><strong>Szerokość: </strong></td><td class="wymiary-right">' ?><?php the_field('szerokosc'); echo'</td></tr>'?><?php endif; ?>
    <?php if(get_field('wysokosc')): echo'<tr><td class="wymiary-left"><strong>Wysokość: </strong></td><td class="wymiary-right">' ?><?php the_field('wysokosc'); echo'</td></tr>'?><?php endif; ?>
    <?php if(get_field('glebokosc')): echo'<tr><td class="wymiary-left"><strong>Głębokość: </strong></td><td class="wymiary-right">' ?><?php the_field('glebokosc'); echo'</td></tr>'?><?php endif; ?>
    <?php if(get_field('dlugosc')): echo'<tr><td class="wymiary-left"><strong>Długość: </strong></td><td class="wymiary-right">' ?><?php the_field('dlugosc'); echo'</td></tr>'?><?php endif; ?>
</table>
<?php
  echo get_field('fieldname', $post_id);
}