Title: begin_fetch_post_thumbnail_html
Published: April 25, 2014
Last modified: May 20, 2026

---

# do_action( ‘begin_fetch_post_thumbnail_html’, int $post_id, int $post_thumbnail_id, string|int[] $size )

## In this article

 * [Description](https://developer.wordpress.org/reference/hooks/begin_fetch_post_thumbnail_html/?output_format=md#description)
 * [Parameters](https://developer.wordpress.org/reference/hooks/begin_fetch_post_thumbnail_html/?output_format=md#parameters)
 * [Source](https://developer.wordpress.org/reference/hooks/begin_fetch_post_thumbnail_html/?output_format=md#source)
 * [Related](https://developer.wordpress.org/reference/hooks/begin_fetch_post_thumbnail_html/?output_format=md#related)
 * [Changelog](https://developer.wordpress.org/reference/hooks/begin_fetch_post_thumbnail_html/?output_format=md#changelog)

[ Back to top](https://developer.wordpress.org/reference/hooks/begin_fetch_post_thumbnail_html/?output_format=md#wp--skip-link--target)

Fires before fetching the post thumbnail HTML.

## 󠀁[Description](https://developer.wordpress.org/reference/hooks/begin_fetch_post_thumbnail_html/?output_format=md#description)󠁿

Provides “just in time” filtering of all filters in [wp_get_attachment_image()](https://developer.wordpress.org/reference/functions/wp_get_attachment_image/).

## 󠀁[Parameters](https://developer.wordpress.org/reference/hooks/begin_fetch_post_thumbnail_html/?output_format=md#parameters)󠁿

 `$post_id`int

The post ID.

`$post_thumbnail_id`int

The post thumbnail ID.

`$size`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).

## 󠀁[Source](https://developer.wordpress.org/reference/hooks/begin_fetch_post_thumbnail_html/?output_format=md#source)󠁿

    ```php
    do_action( 'begin_fetch_post_thumbnail_html', $post->ID, $post_thumbnail_id, $size );
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes/post-thumbnail-template.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/7.0/src/wp-includes/post-thumbnail-template.php#L200)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/post-thumbnail-template.php#L200-L200)

## 󠀁[Related](https://developer.wordpress.org/reference/hooks/begin_fetch_post_thumbnail_html/?output_format=md#related)󠁿

| Used by | Description | 
| [get_the_post_thumbnail()](https://developer.wordpress.org/reference/functions/get_the_post_thumbnail/)`wp-includes/post-thumbnail-template.php` |

Retrieves the post thumbnail.

  |

## 󠀁[Changelog](https://developer.wordpress.org/reference/hooks/begin_fetch_post_thumbnail_html/?output_format=md#changelog)󠁿

| Version | Description | 
| [2.9.0](https://developer.wordpress.org/reference/since/2.9.0/) | Introduced. |

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