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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 |
|---|---|
| 2304 | |
| 2305 | $wpdb->query( $wpdb->prepare( "DELETE FROM $wpdb->comments WHERE comment_post_ID = %d", $postid )); |
| 2306 | |
| 2307 | $wpdb->query( $wpdb->prepare( "DELETE FROM $wpdb->postmeta WHERE post_id = %d ", $postid )); |
| 2308 | |
| 2309 | if ( ! empty($meta['thumb']) ) { |
| 2310 | // Don't delete the thumb if another attachment uses it |
| 2311 | 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)) ) { |
| 2312 | $thumbfile = str_replace(basename($file), $meta['thumb'], $file); |
| 2313 | $thumbfile = apply_filters('wp_delete_file', $thumbfile); |
| 2314 | @ unlink($thumbfile); |
| 2315 | } |
| 2316 | } |
| 2317 | |
| 2318 | // remove intermediate images if there are any |
| 2319 | $sizes = apply_filters('intermediate_image_sizes', array('thumbnail', 'medium')); |
| 2320 | foreach ( $sizes as $size ) { |
| 2321 | if ( $intermediate = image_get_intermediate_size($postid, $size) ) { |
| 2322 | $intermediate_file = apply_filters('wp_delete_file', $intermediate['path']); |
| 2323 | @ unlink($intermediate_file); |
| 2324 | } |
| 2325 | } |
| 2326 | |
| 2327 | $file = apply_filters('wp_delete_file', $file); |
| 2328 | |
| 2329 | if ( ! empty($file) ) |
| 2330 | @ unlink($file); |
| 2331 | |
| 2332 | clean_post_cache($postid); |
| 2333 | |
| 2334 | do_action('delete_attachment', $postid); |
| 2335 | |
| 2336 | return $post; |