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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 |
|---|---|
| 276 | if ( '' != $link && ( ( isset($post->post_status) && 'draft' != $post->post_status && 'pending' != $post->post_status ) || $sample ) ) { |
| 277 | if ( ! $leavename ) |
| 278 | $link = str_replace('%pagename%', get_page_uri($id), $link); |
| 279 | $link = home_url($link); |
| 280 | $link = user_trailingslashit($link, 'page'); |
| 281 | } else { |
| 282 | $link = home_url("?page_id=$id"); |
| 283 | } |
| 284 | |
| 285 | return apply_filters( '_get_page_link', $link, $id ); |
| 286 | } |
| 287 | |
| 288 | /** |
| 289 | * Retrieve permalink for attachment. |
| 290 | * |
| 291 | * This can be used in the WordPress Loop or outside of it. |
| 292 | * |
| 293 | * @since 2.0.0 |
| 294 | * |