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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 |
|---|---|
| 1445 | @ unlink($thumbfile); |
| 1446 | } |
| 1447 | } |
| 1448 | |
| 1449 | $file = apply_filters('wp_delete_file', $file); |
| 1450 | |
| 1451 | if ( ! empty($file) ) |
| 1452 | @ unlink($file); |
| 1453 | |
| 1454 | do_action('delete_attachment', $postid); |
| 1455 | |
| 1456 | return $post; |
| 1457 | } |
| 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 | |