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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 |
|---|---|
| 1918 | * |
| 1919 | * @since 2.5.0 |
| 1920 | * @since 4.4.0 Added the `$post` parameter. |
| 1921 | * @since 4.9.0 Added the `$order` parameter. |
| 1922 | * |
| 1923 | * @param string $order_by The `ORDER BY` clause in the SQL. |
| 1924 | * @param WP_Post $post WP_Post object. |
| 1925 | * @param string $order Sort order. 'DESC' for previous post, 'ASC' for next. |
| 1926 | */ |
| 1927 | $sort = apply_filters( "get_{$adjacent}_post_sort", "ORDER BY p.post_date $order LIMIT 1", $post, $order ); |
| 1928 | |
| 1929 | $query = "SELECT p.ID FROM $wpdb->posts AS p $join $where $sort"; |
| 1930 | $query_key = 'adjacent_post_' . md5( $query ); |
| 1931 | $result = wp_cache_get( $query_key, 'counts' ); |
| 1932 | if ( false !== $result ) { |
| 1933 | if ( $result ) { |
| 1934 | $result = get_post( $result ); |
| 1935 | } |
| 1936 | return $result; |