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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 |
---|---|
1721 | * The dynamic portion of the hook name, `$adjacent`, refers to the type |
1722 | * of adjacency, 'next' or 'previous'. |
1723 | * |
1724 | * @since 2.5.0 |
1725 | * @since 4.4.0 Added the `$post` parameter. |
1726 | * |
1727 | * @param string $order_by The `ORDER BY` clause in the SQL. |
1728 | * @param WP_Post $post WP_Post object. |
1729 | */ |
1730 | $sort = apply_filters( "get_{$adjacent}_post_sort", "ORDER BY p.post_date $order LIMIT 1", $post ); |
1731 |
|
1732 | $query = "SELECT p.ID FROM $wpdb->posts AS p $join $where $sort"; |
1733 | $query_key = 'adjacent_post_' . md5( $query ); |
1734 | $result = wp_cache_get( $query_key, 'counts' ); |
1735 | if ( false !== $result ) { |
1736 | if ( $result ) |
1737 | $result = get_post( $result ); |
1738 | return $result; |
1739 | } |