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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 |
|---|---|
| 1480 | /** |
| 1481 | * Fires immediately before a comment is deleted from the database. |
| 1482 | * |
| 1483 | * @since 1.2.0 |
| 1484 | * @since 4.9.0 Added the `$comment` parameter. |
| 1485 | * |
| 1486 | * @param int $comment_id The comment ID. |
| 1487 | * @param WP_Comment $comment The comment to be deleted. |
| 1488 | */ |
| 1489 | do_action( 'delete_comment', $comment->comment_ID, $comment ); |
| 1490 | |
| 1491 | // Move children up a level. |
| 1492 | $children = $wpdb->get_col( $wpdb->prepare( "SELECT comment_ID FROM $wpdb->comments WHERE comment_parent = %d", $comment->comment_ID ) ); |
| 1493 | if ( ! empty( $children ) ) { |
| 1494 | $wpdb->update( $wpdb->comments, array( 'comment_parent' => $comment->comment_parent ), array( 'comment_parent' => $comment->comment_ID ) ); |
| 1495 | clean_comment_cache( $children ); |
| 1496 | } |
| 1497 | |
| 1498 | // Delete metadata. |