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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.
This hook occurs 3 times in this file.
| Line | Code |
|---|---|
| 2446 | |
| 2447 | $wpdb->query( $wpdb->prepare( "DELETE FROM $wpdb->postmeta WHERE post_id = %d ", $postid )); |
| 2448 | |
| 2449 | $uploadPath = wp_upload_dir(); |
| 2450 | |
| 2451 | if ( ! empty($meta['thumb']) ) { |
| 2452 | // Don't delete the thumb if another attachment uses it |
| 2453 | if (! $wpdb->get_row( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE meta_key = '_wp_attachment_metadata' AND meta_value LIKE %s AND post_id <> %d", '%'.$meta['thumb'].'%', $postid)) ) { |
| 2454 | $thumbfile = str_replace(basename($file), $meta['thumb'], $file); |
| 2455 | $thumbfile = apply_filters('wp_delete_file', $thumbfile); |
| 2456 | @ unlink( path_join($uploadPath['basedir'], $thumbfile) ); |
| 2457 | } |
| 2458 | } |
| 2459 | |
| 2460 | // remove intermediate images if there are any |
| 2461 | $sizes = apply_filters('intermediate_image_sizes', array('thumbnail', 'medium', 'large')); |
| 2462 | foreach ( $sizes as $size ) { |
| 2463 | if ( $intermediate = image_get_intermediate_size($postid, $size) ) { |
| 2464 | $intermediate_file = apply_filters('wp_delete_file', $intermediate['path']); |
| 2465 | @ unlink( path_join($uploadPath['basedir'], $intermediate_file) ); |
| 2466 | } |
| 2467 | } |
| 2468 | |
| 2469 | $file = apply_filters('wp_delete_file', $file); |
| 2470 | |
| 2471 | if ( ! empty($file) ) |
| 2472 | @ unlink($file); |
| 2473 | |
| 2474 | clean_post_cache($postid); |
| 2475 | |
| 2476 | do_action('delete_attachment', $postid); |
| 2477 | |
| 2478 | return $post; |