apply_filters( 'admin_post_thumbnail_size', string|int[] $size, int $thumbnail_id, WP_Post $post )

Filters the size used to display the post thumbnail image in the ‘Featured image’ meta box.


Note: When a theme adds ‘post-thumbnail’ support, a special ‘post-thumbnail’ image size is registered, which differs from the ‘thumbnail’ image size managed via the Settings > Media screen.

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(string|int[]) Requested image size. Can be any registered image size name, or an array of width and height values in pixels (in that order).


(int) Post thumbnail attachment ID.


(WP_Post) The post object associated with the thumbnail.

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File: wp-admin/includes/post.php

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Version Description
4.4.0 Introduced.

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