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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 |
|---|---|
| 1458 | |
| 1459 | function wp_get_attachment_metadata( $post_id, $unfiltered = false ) { |
| 1460 | $post_id = (int) $post_id; |
| 1461 | if ( !$post =& get_post( $post_id ) ) |
| 1462 | return false; |
| 1463 | |
| 1464 | $data = get_post_meta( $post->ID, '_wp_attachment_metadata', true ); |
| 1465 | if ( $unfiltered ) |
| 1466 | return $data; |
| 1467 | return apply_filters( 'wp_get_attachment_metadata', $data, $post->ID ); |
| 1468 | } |
| 1469 | |
| 1470 | function wp_update_attachment_metadata( $post_id, $data ) { |
| 1471 | $post_id = (int) $post_id; |
| 1472 | if ( !$post =& get_post( $post_id ) ) |
| 1473 | return false; |
| 1474 | |
| 1475 | $old_data = wp_get_attachment_metadata( $post->ID, true ); |
| 1476 | |