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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 |
|---|---|
| 23 | } |
| 24 | |
| 25 | /** |
| 26 | * Filters the thumbnail image ID for use in the embed template. |
| 27 | * |
| 28 | * @since 4.9.0 |
| 29 | * |
| 30 | * @param int|false $thumbnail_id Attachment ID, or false if there is none. |
| 31 | */ |
| 32 | $thumbnail_id = apply_filters( 'embed_thumbnail_id', $thumbnail_id ); |
| 33 | |
| 34 | if ( $thumbnail_id ) { |
| 35 | $aspect_ratio = 1; |
| 36 | $measurements = array( 1, 1 ); |
| 37 | $image_size = 'full'; // Fallback. |
| 38 | |
| 39 | $meta = wp_get_attachment_metadata( $thumbnail_id ); |
| 40 | if ( ! empty( $meta['sizes'] ) ) { |
| 41 | foreach ( $meta['sizes'] as $size => $data ) { |