Тест

Все зарегистрированные размеры изображений (wp_get_registered_image_subsizes)

Array
(
    [thumbnail] => Array
        (
            [width] => 150
            [height] => 150
            [crop] => 1
        )

    [medium] => Array
        (
            [width] => 300
            [height] => 300
            [crop] => 
        )

    [medium_large] => Array
        (
            [width] => 768
            [height] => 0
            [crop] => 
        )

    [large] => Array
        (
            [width] => 1024
            [height] => 1024
            [crop] => 
        )

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

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

    [portfolio-thumbnail] => Array
        (
            [width] => 600
            [height] => 600
            [crop] => 1
        )

    [post-hd] => Array
        (
            [width] => 1376
            [height] => 768
            [crop] => 1
        )

    [post-square] => Array
        (
            [width] => 1080
            [height] => 1080
            [crop] => 1
        )

    [post-thumbnail] => Array
        (
            [width] => 540
            [height] => 540
            [crop] => 1
        )

)

Все размеры через get_intermediate_image_sizes()

Array
(
    [0] => thumbnail
    [1] => medium
    [2] => medium_large
    [3] => large
    [4] => 1536x1536
    [5] => 2048x2048
    [6] => portfolio-thumbnail
    [7] => post-hd
    [8] => post-square
    [9] => post-thumbnail
)

Детальная информация по каждому размеру

Все размеры для thumbnail текущей записи (ID: 903)

Array
(
    [width] => 880
    [height] => 494
    [file] => 2026/08/r4taehrt.jpg
    [filesize] => 78280
    [sizes] => Array
        (
            [medium] => Array
                (
                    [file] => r4taehrt-300x168.jpg
                    [width] => 300
                    [height] => 168
                    [mime-type] => image/jpeg
                    [filesize] => 12946
                )

            [thumbnail] => Array
                (
                    [file] => r4taehrt-150x150.jpg
                    [width] => 150
                    [height] => 150
                    [mime-type] => image/jpeg
                    [filesize] => 6706
                )

            [medium_large] => Array
                (
                    [file] => r4taehrt-768x431.jpg
                    [width] => 768
                    [height] => 431
                    [mime-type] => image/jpeg
                    [filesize] => 47129
                )

            [portfolio-thumbnail] => Array
                (
                    [file] => r4taehrt-600x494.jpg
                    [width] => 600
                    [height] => 494
                    [mime-type] => image/jpeg
                    [filesize] => 43551
                )

            [post-thumbnail] => Array
                (
                    [file] => r4taehrt-540x494.jpg
                    [width] => 540
                    [height] => 494
                    [mime-type] => image/jpeg
                    [filesize] => 39343
                )

        )

    [image_meta] => Array
        (
            [aperture] => 0
            [credit] => 
            [camera] => 
            [caption] => 
            [created_timestamp] => 0
            [copyright] => 
            [focal_length] => 0
            [iso] => 0
            [shutter_speed] => 0
            [title] => 
            [orientation] => 0
            [keywords] => Array
                (
                )

            [alt] => 
        )

)