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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 |
|---|---|
| 1820 | * @since 2.5.0 |
| 1821 | * @since 4.4.0 Added the `$taxonomy` and `$post` parameters. |
| 1822 | * |
| 1823 | * @param string $join The JOIN clause in the SQL. |
| 1824 | * @param bool $in_same_term Whether post should be in a same taxonomy term. |
| 1825 | * @param array $excluded_terms Array of excluded term IDs. |
| 1826 | * @param string $taxonomy Taxonomy. Used to identify the term used when `$in_same_term` is true. |
| 1827 | * @param WP_Post $post WP_Post object. |
| 1828 | */ |
| 1829 | $join = apply_filters( "get_{$adjacent}_post_join", $join, $in_same_term, $excluded_terms, $taxonomy, $post ); |
| 1830 | |
| 1831 | /** |
| 1832 | * Filters the WHERE clause in the SQL for an adjacent post query. |
| 1833 | * |
| 1834 | * The dynamic portion of the hook name, `$adjacent`, refers to the type |
| 1835 | * of adjacency, 'next' or 'previous'. |
| 1836 | * |
| 1837 | * @since 2.5.0 |
| 1838 | * @since 4.4.0 Added the `$taxonomy` and `$post` parameters. |