Many thanks for Your advise 🙂
My working code is
<?php
// check if the repeater field has rows of data
if( have_rows('zdjecia') ):
// loop through the rows of data
while ( have_rows('zdjecia') ) : the_row();
// display a sub field value ?>
<div class="entry-thumb">
<?php
$image = get_sub_field('zdjecie', false);
$size = 'sydney-large-thumb'; // (thumbnail, medium, large, full or custom size)
if( $image ) {
echo wp_get_attachment_image( $image, $size );}
?>
</div>
<?php endwhile;
else :
// no rows found
endif;?>
