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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 |
|---|---|
| 2239 | * @return int {@internal Missing Description}} |
| 2240 | */ |
| 2241 | function wp_update_attachment_metadata( $post_id, $data ) { |
| 2242 | $post_id = (int) $post_id; |
| 2243 | if ( !$post =& get_post( $post_id ) ) |
| 2244 | return false; |
| 2245 | |
| 2246 | $old_data = wp_get_attachment_metadata( $post->ID, true ); |
| 2247 | |
| 2248 | $data = apply_filters( 'wp_update_attachment_metadata', $data, $post->ID ); |
| 2249 | |
| 2250 | if ( $old_data ) |
| 2251 | return update_post_meta( $post->ID, '_wp_attachment_metadata', $data, $old_data ); |
| 2252 | else |
| 2253 | return add_post_meta( $post->ID, '_wp_attachment_metadata', $data ); |
| 2254 | } |
| 2255 | |
| 2256 | /** |
| 2257 | * wp_get_attachment_url() - Retrieve the URL for an attachment |