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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 |
|---|---|
| 266 | $name = $object->post_name; |
| 267 | if (strpos($parentlink, '?') === false) |
| 268 | $link = user_trailingslashit( trailingslashit($parentlink) . $name ); |
| 269 | } |
| 270 | |
| 271 | if (! $link ) { |
| 272 | $link = trailingslashit(get_bloginfo('url')) . "?attachment_id=$id"; |
| 273 | } |
| 274 | |
| 275 | return apply_filters('attachment_link', $link, $id); |
| 276 | } |
| 277 | |
| 278 | /** |
| 279 | * Retrieve the permalink for the year archives. |
| 280 | * |
| 281 | * @since 1.5.0 |
| 282 | * |
| 283 | * @param int|bool $year False for current year or year for permalink. |
| 284 | * @return string |