1.Creating Gallery field:
// a field array( 'id' => 'gallery_2', 'type' => 'gallery', 'title' => 'Logos of the happy clients', 'add_title' => 'Add Images', 'edit_title' => 'Edit Images', 'clear_title' => 'Remove Images', ),
2. Showing the gallery on frontend:
$meta_data = get_post_meta( get_the_ID(), 'section_testimonial', true );
$gallery = $meta_data['gallery_2'];
if ( ! empty( $gallery ) ) {
$ids = explode( ',', $gallery );
foreach ( $ids as $id ) {
$attachment = wp_get_attachment_image_src( $id, 'full' );
?>
<li data-sr='enter top, wait 0.2s'><img src="<?php echo $attachment[0]; ?>"
alt=""></li>
<?php }
}