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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 |
|---|---|
| 1602 | * managed via the Settings > Media screen. |
| 1603 | * |
| 1604 | * @since 4.4.0 |
| 1605 | * |
| 1606 | * @param string|int[] $size Requested image size. Can be any registered image size name, or |
| 1607 | * an array of width and height values in pixels (in that order). |
| 1608 | * @param int $thumbnail_id Post thumbnail attachment ID. |
| 1609 | * @param WP_Post $post The post object associated with the thumbnail. |
| 1610 | */ |
| 1611 | $size = apply_filters( 'admin_post_thumbnail_size', $size, $thumbnail_id, $post ); |
| 1612 | |
| 1613 | $thumbnail_html = wp_get_attachment_image( $thumbnail_id, $size ); |
| 1614 | |
| 1615 | if ( ! empty( $thumbnail_html ) ) { |
| 1616 | $content = sprintf( |
| 1617 | $set_thumbnail_link, |
| 1618 | esc_url( $upload_iframe_src ), |
| 1619 | ' aria-describedby="set-post-thumbnail-desc"', |
| 1620 | $thumbnail_html |