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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 |
|---|---|
| 318 | $link = user_trailingslashit( trailingslashit($parentlink) . '%postname%' ); |
| 319 | |
| 320 | if ( ! $leavename ) |
| 321 | $link = str_replace( '%postname%', $name, $link ); |
| 322 | } |
| 323 | |
| 324 | if ( ! $link ) |
| 325 | $link = home_url( '/?attachment_id=' . $post->ID ); |
| 326 | |
| 327 | return apply_filters( 'attachment_link', $link, $post->ID ); |
| 328 | } |
| 329 | |
| 330 | /** |
| 331 | * Retrieve the permalink for the year archives. |
| 332 | * |
| 333 | * @since 1.5.0 |
| 334 | * |
| 335 | * @param int|bool $year False for current year or year for permalink. |
| 336 | * @return string |