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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 |
|---|---|
| 2351 | */ |
| 2352 | function wp_get_attachment_metadata( $post_id, $unfiltered = false ) { |
| 2353 | $post_id = (int) $post_id; |
| 2354 | if ( !$post =& get_post( $post_id ) ) |
| 2355 | return false; |
| 2356 | |
| 2357 | $data = get_post_meta( $post->ID, '_wp_attachment_metadata', true ); |
| 2358 | if ( $unfiltered ) |
| 2359 | return $data; |
| 2360 | return apply_filters( 'wp_get_attachment_metadata', $data, $post->ID ); |
| 2361 | } |
| 2362 | |
| 2363 | /** |
| 2364 | * wp_update_attachment_metadata() - Update metadata for an attachment |
| 2365 | * |
| 2366 | * {@internal Missing Long Description}} |
| 2367 | * |
| 2368 | * @package WordPress |
| 2369 | * @subpackage Post |