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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 |
|---|---|
| 2199 | * @since 2.6.0 |
| 2200 | * @since 4.2.0 Added the `$adjacent` parameter. |
| 2201 | * |
| 2202 | * @param string $output The adjacent post link. |
| 2203 | * @param string $format Link anchor format. |
| 2204 | * @param string $link Link permalink format. |
| 2205 | * @param WP_Post $post The adjacent post. |
| 2206 | * @param string $adjacent Whether the post is previous or next. |
| 2207 | */ |
| 2208 | return apply_filters( "{$adjacent}_post_link", $output, $format, $link, $post, $adjacent ); |
| 2209 | } |
| 2210 | |
| 2211 | /** |
| 2212 | * Displays the adjacent post link. |
| 2213 | * |
| 2214 | * Can be either next post link or previous. |
| 2215 | * |
| 2216 | * @since 2.5.0 |
| 2217 | * |