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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 |
|---|---|
| 1830 | * @since 2.5.0 |
| 1831 | * @since 4.4.0 Added the `$taxonomy` and `$post` parameters. |
| 1832 | * |
| 1833 | * @param string $where The `WHERE` clause in the SQL. |
| 1834 | * @param bool $in_same_term Whether post should be in a same taxonomy term. |
| 1835 | * @param array $excluded_terms Array of excluded term IDs. |
| 1836 | * @param string $taxonomy Taxonomy. Used to identify the term used when `$in_same_term` is true. |
| 1837 | * @param WP_Post $post WP_Post object. |
| 1838 | */ |
| 1839 | $where = apply_filters( "get_{$adjacent}_post_where", $wpdb->prepare( "WHERE p.post_date $op %s AND p.post_type = %s $where", $current_post_date, $post->post_type ), $in_same_term, $excluded_terms, $taxonomy, $post ); |
| 1840 | |
| 1841 | /** |
| 1842 | * Filters the ORDER BY clause in the SQL for an adjacent post query. |
| 1843 | * |
| 1844 | * The dynamic portion of the hook name, `$adjacent`, refers to the type |
| 1845 | * of adjacency, 'next' or 'previous'. |
| 1846 | * |
| 1847 | * @since 2.5.0 |
| 1848 | * @since 4.4.0 Added the `$post` parameter. |