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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 |
|---|---|
| 2395 | function wp_trash_post_comments($post = null) { |
| 2396 | global $wpdb; |
| 2397 | |
| 2398 | $post = get_post($post); |
| 2399 | if ( empty($post) ) |
| 2400 | return; |
| 2401 | |
| 2402 | $post_id = $post->ID; |
| 2403 | |
| 2404 | do_action('trash_post_comments', $post_id); |
| 2405 | |
| 2406 | $comments = $wpdb->get_results( $wpdb->prepare("SELECT comment_ID, comment_approved FROM $wpdb->comments WHERE comment_post_ID = %d", $post_id) ); |
| 2407 | if ( empty($comments) ) |
| 2408 | return; |
| 2409 | |
| 2410 | // Cache current status for each comment |
| 2411 | $statuses = array(); |
| 2412 | foreach ( $comments as $comment ) |
| 2413 | $statuses[$comment->comment_ID] = $comment->comment_approved; |