Array
(
    [0] => thumbnail
    [1] => medium
    [2] => medium_large
    [3] => large
    [4] => 1536x1536
    [5] => 2048x2048
    [6] => custom-size
    [7] => medium_large
    [8] => size_1536
    [9] => size_2048
    [10] => widget
    [11] => square
    [12] => square-bigger
    [13] => featured
    [14] => news-card-extended
    [15] => news-card-normal
    [16] => news-case
    [17] => featured_large
    [18] => extra_large
    [19] => portfolio
    [20] => portfolio_small
    [21] => gallery
    [22] => magazine
    [23] => masonry
    [24] => entry_with_sidebar
    [25] => entry_without_sidebar
    [26] => staff_members
    [27] => custom-ancora-lg
    [28] => custom-ancora-md
    [29] => custom-ancora-xs
)