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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 |
|---|---|
| 1865 | * of adjacency, 'next' or 'previous'. |
| 1866 | * |
| 1867 | * @since 2.6.0 |
| 1868 | * |
| 1869 | * @param string $output The adjacent post link. |
| 1870 | * @param string $format Link anchor format. |
| 1871 | * @param string $link Link permalink format. |
| 1872 | * @param WP_Post $post The adjacent post. |
| 1873 | */ |
| 1874 | return apply_filters( "{$adjacent}_post_link", $output, $format, $link, $post ); |
| 1875 | } |
| 1876 | |
| 1877 | /** |
| 1878 | * Display adjacent post link. |
| 1879 | * |
| 1880 | * Can be either next post link or previous. |
| 1881 | * |
| 1882 | * @since 2.5.0 |
| 1883 | * |