apply_filters( 'post_thumbnail_html', string $html, int $post_id, int $post_thumbnail_id, string|int[] $size, string|array $attr )

Parameters

$html

The post thumbnail HTML.

$post_id

The post ID.

$post_thumbnail_id

The post thumbnail ID, or 0 if there isn't one.

$size

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

$attr

Query string or array of attributes.