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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 |
---|---|
1968 | * |
1969 | * @since 2.5.0 |
1970 | * @since 4.4.0 Added the `$post` parameter. |
1971 | * @since 4.9.0 Added the `$order` parameter. |
1972 | * |
1973 | * @param string $order_by The `ORDER BY` clause in the SQL. |
1974 | * @param WP_Post $post WP_Post object. |
1975 | * @param string $order Sort order. 'DESC' for previous post, 'ASC' for next. |
1976 | */ |
1977 | $sort = apply_filters( "get_{$adjacent}_post_sort", "ORDER BY p.post_date $order LIMIT 1", $post, $order ); |
1978 |
|
1979 | $query = "SELECT p.ID FROM $wpdb->posts AS p $join $where $sort"; |
1980 | $key = md5( $query ); |
1981 | $last_changed = wp_cache_get_last_changed( 'posts' ); |
1982 | if ( $in_same_term || ! empty( $excluded_terms ) ) { |
1983 | $last_changed .= wp_cache_get_last_changed( 'terms' ); |
1984 | } |
1985 | $cache_key = "adjacent_post:$key:$last_changed"; |
1986 |
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