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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 |
|---|---|
| 2019 | * @since 2.6.0 |
| 2020 | * @since 4.2.0 Added the `$adjacent` parameter. |
| 2021 | * |
| 2022 | * @param string $output The adjacent post link. |
| 2023 | * @param string $format Link anchor format. |
| 2024 | * @param string $link Link permalink format. |
| 2025 | * @param WP_Post $post The adjacent post. |
| 2026 | * @param string $adjacent Whether the post is previous or next. |
| 2027 | */ |
| 2028 | return apply_filters( "{$adjacent}_post_link", $output, $format, $link, $post, $adjacent ); |
| 2029 | } |
| 2030 | |
| 2031 | /** |
| 2032 | * Display adjacent post link. |
| 2033 | * |
| 2034 | * Can be either next post link or previous. |
| 2035 | * |
| 2036 | * @since 2.5.0 |
| 2037 | * |