array(8) {
[0]=>
string(9) "thumbnail"
[1]=>
string(6) "medium"
[2]=>
string(12) "medium_large"
[3]=>
string(5) "large"
[4]=>
string(22) "wysija-newsletters-max"
[5]=>
string(14) "shop_thumbnail"
[6]=>
string(12) "shop_catalog"
[7]=>
string(11) "shop_single"
}