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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 |
|---|---|
| 316 | /** |
| 317 | * Filter the permalink for a page. |
| 318 | * |
| 319 | * @since 1.5.0 |
| 320 | * |
| 321 | * @param string $link The page's permalink. |
| 322 | * @param int $post_id The ID of the page. |
| 323 | * @param bool $sample Is it a sample permalink. |
| 324 | */ |
| 325 | return apply_filters( 'page_link', $link, $post->ID, $sample ); |
| 326 | } |
| 327 | |
| 328 | /** |
| 329 | * Retrieve the page permalink. |
| 330 | * |
| 331 | * Ignores page_on_front. Internal use only. |
| 332 | * |
| 333 | * @since 2.1.0 |
| 334 | * @access private |