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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 |
|---|---|
| 2338 | $shortlink = ''; |
| 2339 | |
| 2340 | // Return p= link for posts. |
| 2341 | if ( !empty($post_id) && '' != get_option('permalink_structure') ) { |
| 2342 | $post = get_post($post_id); |
| 2343 | if ( isset($post->post_type) && 'post' == $post->post_type ) |
| 2344 | $shortlink = home_url('?p=' . $post->ID); |
| 2345 | } |
| 2346 | |
| 2347 | return apply_filters('get_shortlink', $shortlink, $id, $context, $allow_slugs); |
| 2348 | } |
| 2349 | |
| 2350 | /** |
| 2351 | * Inject rel=shortlink into head if a shortlink is defined for the current page. |
| 2352 | * |
| 2353 | * Attached to the wp_head action. |
| 2354 | * |
| 2355 | * @since 3.0.0 |
| 2356 | * |