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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 |
|---|---|
| 1734 | * |
| 1735 | * @since 2.3.0 |
| 1736 | * |
| 1737 | * @param string $new_status Transition to this post status. |
| 1738 | * @param string $old_status Previous post status. |
| 1739 | * @param object $post Post data. |
| 1740 | */ |
| 1741 | function wp_transition_post_status($new_status, $old_status, $post) { |
| 1742 | if ( $new_status != $old_status ) { |
| 1743 | do_action('transition_post_status', $new_status, $old_status, $post); |
| 1744 | do_action("${old_status}_to_$new_status", $post); |
| 1745 | } |
| 1746 | do_action("${new_status}_$post->post_type", $post->ID, $post); |
| 1747 | } |
| 1748 | |
| 1749 | // |
| 1750 | // Trackback and ping functions |
| 1751 | // |
| 1752 | |