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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 |
|---|---|
| 3996 | * |
| 3997 | * Therefore, if you are looking to only fire a callback when a post is first |
| 3998 | * transitioned to a status, use the {@see 'transition_post_status'} hook instead. |
| 3999 | * |
| 4000 | * @since 2.3.0 |
| 4001 | * |
| 4002 | * @param int $post_id Post ID. |
| 4003 | * @param WP_Post $post Post object. |
| 4004 | */ |
| 4005 | do_action( "{$new_status}_{$post->post_type}", $post->ID, $post ); |
| 4006 | } |
| 4007 | |
| 4008 | // |
| 4009 | // Trackback and ping functions |
| 4010 | // |
| 4011 | |
| 4012 | /** |
| 4013 | * Add a URL to those already pinged. |
| 4014 | * |