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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 |
|---|---|
| 168 | $parentlink = get_permalink( $object->post_parent ); |
| 169 | if (strpos($parentlink, '?') === false) |
| 170 | $link = trailingslashit($parentlink) . $object->post_name . '/'; |
| 171 | } |
| 172 | |
| 173 | if (! $link ) { |
| 174 | $link = get_bloginfo('url') . "/?attachment_id=$id"; |
| 175 | } |
| 176 | |
| 177 | return apply_filters('attachment_link', $link, $id); |
| 178 | } |
| 179 | |
| 180 | function get_year_link($year) { |
| 181 | global $wp_rewrite; |
| 182 | if ( !$year ) |
| 183 | $year = gmdate('Y', time()+(get_option('gmt_offset') * 3600)); |
| 184 | $yearlink = $wp_rewrite->get_year_permastruct(); |
| 185 | if ( !empty($yearlink) ) { |
| 186 | $yearlink = str_replace('%year%', $year, $yearlink); |