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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 |
|---|---|
| 2216 | */ |
| 2217 | function wp_get_attachment_metadata( $post_id, $unfiltered = false ) { |
| 2218 | $post_id = (int) $post_id; |
| 2219 | if ( !$post =& get_post( $post_id ) ) |
| 2220 | return false; |
| 2221 | |
| 2222 | $data = get_post_meta( $post->ID, '_wp_attachment_metadata', true ); |
| 2223 | if ( $unfiltered ) |
| 2224 | return $data; |
| 2225 | return apply_filters( 'wp_get_attachment_metadata', $data, $post->ID ); |
| 2226 | } |
| 2227 | |
| 2228 | /** |
| 2229 | * wp_update_attachment_metadata() - Update metadata for an attachment |
| 2230 | * |
| 2231 | * {@internal Missing Long Description}} |
| 2232 | * |
| 2233 | * @package WordPress |
| 2234 | * @subpackage Post |