Array
(
    [1536x1536] => Array
        (
            [width] => 1536
            [height] => 1536
            [crop] => 
        )

    [2048x2048] => Array
        (
            [width] => 2048
            [height] => 2048
            [crop] => 
        )

    [post-thumbnail] => Array
        (
            [width] => 600
            [height] => 9999
            [crop] => 
        )

    [post-image] => Array
        (
            [width] => 945
            [height] => 9999
            [crop] => 
        )

)