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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 1411 | * @since 4.4.0 |
| 1412 | * |
| 1413 | * @param string|array $size Post thumbnail image size to display in the meta box. Accepts any valid |
| 1414 | * image size, or an array of width and height values in pixels (in that order). |
| 1415 | * If the 'post-thumbnail' size is set, default is 'post-thumbnail'. Otherwise, |
| 1416 | * default is an array with 266 as both the height and width values. |
| 1417 | * @param int $thumbnail_id Post thumbnail attachment ID. |
| 1418 | * @param WP_Post $post The post object associated with the thumbnail. |
| 1419 | */ |
| 1420 | $size = apply_filters( 'admin_post_thumbnail_size', $size, $thumbnail_id, $post ); |
| 1421 | |
| 1422 | $thumbnail_html = wp_get_attachment_image( $thumbnail_id, $size ); |
| 1423 | |
| 1424 | if ( ! empty( $thumbnail_html ) ) { |
| 1425 | $content = sprintf( $set_thumbnail_link, |
| 1426 | esc_url( $upload_iframe_src ), |
| 1427 | ' aria-describedby="set-post-thumbnail-desc"', |
| 1428 | $thumbnail_html |
| 1429 | ); |