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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 |
|---|---|
| 1557 | * managed via the Settings > Media screen. |
| 1558 | * |
| 1559 | * @since 4.4.0 |
| 1560 | * |
| 1561 | * @param string|int[] $size Requested image size. Can be any registered image size name, or |
| 1562 | * an array of width and height values in pixels (in that order). |
| 1563 | * @param int $thumbnail_id Post thumbnail attachment ID. |
| 1564 | * @param WP_Post $post The post object associated with the thumbnail. |
| 1565 | */ |
| 1566 | $size = apply_filters( 'admin_post_thumbnail_size', $size, $thumbnail_id, $post ); |
| 1567 | |
| 1568 | $thumbnail_html = wp_get_attachment_image( $thumbnail_id, $size ); |
| 1569 | |
| 1570 | if ( ! empty( $thumbnail_html ) ) { |
| 1571 | $content = sprintf( |
| 1572 | $set_thumbnail_link, |
| 1573 | esc_url( $upload_iframe_src ), |
| 1574 | ' aria-describedby="set-post-thumbnail-desc"', |
| 1575 | $thumbnail_html |