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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.
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2169 | * @since 3.0.0. |
2170 | * |
2171 | * @param int $id A post or blog id. Default is 0, which means the current post or blog. |
2172 | * @param string $contex 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'. |
2173 | * @param bool $allow_slugs Whether to allow post slugs in the shortlink. It is up to the plugin how and whether to honor this. |
2174 | * @return string A shortlink or an empty string if no shortlink exists for the requested resource or if shortlinks are not enabled. |
2175 | */ |
2176 | function wp_get_shortlink($id = 0, $context = 'post', $allow_slugs = true) { |
2177 | // Allow plugins to short-circuit this function. |
2178 | $shortlink = apply_filters('pre_get_shortlink', false, $id, $context, $allow_slugs); |
2179 | if ( false !== $shortlink ) |
2180 | return $shortlink; |
2181 |
|
2182 | global $wp_query; |
2183 | $post_id = 0; |
2184 | if ( 'query' == $context && is_single() ) { |
2185 | $post_id = $wp_query->get_queried_object_id(); |
2186 | } elseif ( 'post' == $context ) { |
2187 | $post = get_post($id); |