array(22) { [0]=> string(9) "thumbnail" [1]=> string(6) "medium" [2]=> string(12) "medium_large" [3]=> string(5) "large" [4]=> string(5) "vp_sm" [5]=> string(5) "vp_md" [6]=> string(5) "vp_lg" [7]=> string(5) "vp_xl" [8]=> string(11) "vp_sm_popup" [9]=> string(11) "vp_md_popup" [10]=> string(11) "vp_xl_popup" [11]=> string(9) "1536x1536" [12]=> string(9) "2048x2048" [13]=> string(10) "thumb-1440" [14]=> string(9) "thumb-780" [15]=> string(9) "thumb-360" [16]=> string(21) "woocommerce_thumbnail" [17]=> string(18) "woocommerce_single" [18]=> string(29) "woocommerce_gallery_thumbnail" [19]=> string(12) "shop_catalog" [20]=> string(11) "shop_single" [21]=> string(14) "shop_thumbnail" }