PHP-driven gallery: [av_gallery ids='' style='thumbnails' preview_size='portfolio' crop_big_preview_thumbnail='avia-gallery-big-crop-thumb' thumb_size='portfolio' columns='4' thumbs_hover='' control_layout='av-control-hidden' slider_navigation='av-navigate-arrows' nav_visibility_desktop='' nav_arrow_color='' nav_arrow_bg_color='' imagelink='lightbox' link_dest='' lightbox_text='caption' lazyload='avia_lazyload' img_scrset='' html_lazy_loading='disabled' alb_description='' id='' custom_class='' template_class='' element_template='' one_element_template='' av_uid='' sc_version='1.0' admin_preview_bg='']

Array
(
    [0] => thumbnail
    [1] => medium
    [2] => medium_large
    [3] => large
    [4] => 1536x1536
    [5] => 2048x2048
    [6] => widget
    [7] => square
    [8] => featured
    [9] => featured_large
    [10] => extra_large
    [11] => portfolio
    [12] => portfolio_small
    [13] => gallery
    [14] => magazine
    [15] => masonry
    [16] => entry_with_sidebar
    [17] => entry_without_sidebar
    [18] => gform-image-choice-sm
    [19] => gform-image-choice-md
    [20] => gform-image-choice-lg
)