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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 |
---|---|
2387 | $shortlink = ''; |
2388 |
|
2389 | // Return p= link for posts. |
2390 | if ( !empty($post_id) && '' != get_option('permalink_structure') ) { |
2391 | $post = get_post($post_id); |
2392 | if ( isset($post->post_type) && 'post' == $post->post_type ) |
2393 | $shortlink = home_url('?p=' . $post->ID); |
2394 | } |
2395 |
|
2396 | return apply_filters('get_shortlink', $shortlink, $id, $context, $allow_slugs); |
2397 | } |
2398 |
|
2399 | /** |
2400 | * Inject rel=sortlink into head if a shortlink is defined for the current page. |
2401 | * |
2402 | * Attached to the wp_head action. |
2403 | * |
2404 | * @since 3.0.0 |
2405 | * |