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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 |
|---|---|
| 421 | |
| 422 | /** |
| 423 | * Filter the permalink for an attachment. |
| 424 | * |
| 425 | * @since 2.0.0 |
| 426 | * |
| 427 | * @param string $link The attachment's permalink. |
| 428 | * @param int $post_id Attachment ID. |
| 429 | */ |
| 430 | return apply_filters( 'attachment_link', $link, $post->ID ); |
| 431 | } |
| 432 | |
| 433 | /** |
| 434 | * Retrieve the permalink for the year archives. |
| 435 | * |
| 436 | * @since 1.5.0 |
| 437 | * |
| 438 | * @param int|bool $year False for current year or year for permalink. |
| 439 | * @return string The permalink for the specified year archive. |