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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 |
|---|---|
| 2336 | * @since 3.0.0. |
| 2337 | * |
| 2338 | * @param int $id A post or blog id. Default is 0, which means the current post or blog. |
| 2339 | * @param string $context Whether the id is a 'blog' id, 'post' id, or 'media' id. If 'post', the post_type of the post is consulted. If 'query', the current query is consulted to determine the id and context. Default is 'post'. |
| 2340 | * @param bool $allow_slugs Whether to allow post slugs in the shortlink. It is up to the plugin how and whether to honor this. |
| 2341 | * @return string A shortlink or an empty string if no shortlink exists for the requested resource or if shortlinks are not enabled. |
| 2342 | */ |
| 2343 | function wp_get_shortlink($id = 0, $context = 'post', $allow_slugs = true) { |
| 2344 | // Allow plugins to short-circuit this function. |
| 2345 | $shortlink = apply_filters('pre_get_shortlink', false, $id, $context, $allow_slugs); |
| 2346 | if ( false !== $shortlink ) |
| 2347 | return $shortlink; |
| 2348 | |
| 2349 | global $wp_query; |
| 2350 | $post_id = 0; |
| 2351 | if ( 'query' == $context && is_single() ) { |
| 2352 | $post_id = $wp_query->get_queried_object_id(); |
| 2353 | } elseif ( 'post' == $context ) { |
| 2354 | $post = get_post($id); |