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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 |
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1435 | * @since 4.4.0 |
1436 | * |
1437 | * @param string|array $size Post thumbnail image size to display in the meta box. Accepts any valid |
1438 | * image size, or an array of width and height values in pixels (in that order). |
1439 | * If the 'post-thumbnail' size is set, default is 'post-thumbnail'. Otherwise, |
1440 | * default is an array with 266 as both the height and width values. |
1441 | * @param int $thumbnail_id Post thumbnail attachment ID. |
1442 | * @param WP_Post $post The post object associated with the thumbnail. |
1443 | */ |
1444 | $size = apply_filters( 'admin_post_thumbnail_size', $size, $thumbnail_id, $post ); |
1445 |
|
1446 | $thumbnail_html = wp_get_attachment_image( $thumbnail_id, $size ); |
1447 |
|
1448 | if ( ! empty( $thumbnail_html ) ) { |
1449 | $content = sprintf( $set_thumbnail_link, |
1450 | esc_url( $upload_iframe_src ), |
1451 | ' aria-describedby="set-post-thumbnail-desc"', |
1452 | $thumbnail_html |
1453 | ); |