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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 |
|---|---|
| 1392 | /** |
| 1393 | * Fires immediately before a comment is deleted from the database. |
| 1394 | * |
| 1395 | * @since 1.2.0 |
| 1396 | * @since 4.9.0 Added the `$comment` parameter. |
| 1397 | * |
| 1398 | * @param int $comment_id The comment ID. |
| 1399 | * @param WP_Comment $comment The comment to be deleted. |
| 1400 | */ |
| 1401 | do_action( 'delete_comment', $comment->comment_ID, $comment ); |
| 1402 | |
| 1403 | // Move children up a level. |
| 1404 | $children = $wpdb->get_col( $wpdb->prepare( "SELECT comment_ID FROM $wpdb->comments WHERE comment_parent = %d", $comment->comment_ID ) ); |
| 1405 | if ( ! empty( $children ) ) { |
| 1406 | $wpdb->update( $wpdb->comments, array( 'comment_parent' => $comment->comment_parent ), array( 'comment_parent' => $comment->comment_ID ) ); |
| 1407 | clean_comment_cache( $children ); |
| 1408 | } |
| 1409 | |
| 1410 | // Delete metadata. |