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

Description

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.

Parameters

$sizestring|int[]

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

$thumbnail_idint

Post thumbnail attachment ID.

$postWP_Post

The post object associated with the thumbnail.

Source

$size = apply_filters( 'admin_post_thumbnail_size', $size, $thumbnail_id, $post );

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