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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 |
|---|---|
| 4643 | * Filters the post parent -- used to check for and prevent hierarchy loops. |
| 4644 | * |
| 4645 | * @since 3.1.0 |
| 4646 | * |
| 4647 | * @param int $post_parent Post parent ID. |
| 4648 | * @param int $post_id Post ID. |
| 4649 | * @param array $new_postarr Array of parsed post data. |
| 4650 | * @param array $postarr Array of sanitized, but otherwise unmodified post data. |
| 4651 | */ |
| 4652 | $post_parent = apply_filters( 'wp_insert_post_parent', $post_parent, $post_id, $new_postarr, $postarr ); |
| 4653 | |
| 4654 | /* |
| 4655 | * If the post is being untrashed and it has a desired slug stored in post meta, |
| 4656 | * reassign it. |
| 4657 | */ |
| 4658 | if ( 'trash' === $previous_status && 'trash' !== $post_status ) { |
| 4659 | $desired_post_slug = get_post_meta( $post_id, '_wp_desired_post_slug', true ); |
| 4660 | |
| 4661 | if ( $desired_post_slug ) { |