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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 |
|---|---|
| 1901 | * @since 2.6.0 |
| 1902 | * @since 4.2.0 Added the `$adjacent` parameter. |
| 1903 | * |
| 1904 | * @param string $output The adjacent post link. |
| 1905 | * @param string $format Link anchor format. |
| 1906 | * @param string $link Link permalink format. |
| 1907 | * @param WP_Post $post The adjacent post. |
| 1908 | * @param string $adjacent Whether the post is previous or next. |
| 1909 | */ |
| 1910 | return apply_filters( "{$adjacent}_post_link", $output, $format, $link, $post, $adjacent ); |
| 1911 | } |
| 1912 | |
| 1913 | /** |
| 1914 | * Display adjacent post link. |
| 1915 | * |
| 1916 | * Can be either next post link or previous. |
| 1917 | * |
| 1918 | * @since 2.5.0 |
| 1919 | * |