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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 |
|---|---|
| 388 | |
| 389 | /** |
| 390 | * Filters the permalink for a non-page_on_front page. |
| 391 | * |
| 392 | * @since 2.1.0 |
| 393 | * |
| 394 | * @param string $link The page's permalink. |
| 395 | * @param int $post_id The ID of the page. |
| 396 | */ |
| 397 | return apply_filters( '_get_page_link', $link, $post->ID ); |
| 398 | } |
| 399 | |
| 400 | /** |
| 401 | * Retrieves the permalink for an attachment. |
| 402 | * |
| 403 | * This can be used in the WordPress Loop or outside of it. |
| 404 | * |
| 405 | * @since 2.0.0 |
| 406 | * |