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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 |
|---|---|
| 2425 | $shortlink = ''; |
| 2426 | |
| 2427 | // Return p= link for all public post types. |
| 2428 | if ( ! empty( $post_id ) ) { |
| 2429 | $post_type = get_post_type_object( $post->post_type ); |
| 2430 | if ( $post_type->public ) |
| 2431 | $shortlink = home_url('?p=' . $post_id); |
| 2432 | } |
| 2433 | |
| 2434 | return apply_filters('get_shortlink', $shortlink, $id, $context, $allow_slugs); |
| 2435 | } |
| 2436 | |
| 2437 | /** |
| 2438 | * Inject rel=shortlink into head if a shortlink is defined for the current page. |
| 2439 | * |
| 2440 | * Attached to the wp_head action. |
| 2441 | * |
| 2442 | * @since 3.0.0 |
| 2443 | * |