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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 |
|---|---|
| 1128 | } |
| 1129 | } |
| 1130 | } |
| 1131 | |
| 1132 | $adjacent = $previous ? 'previous' : 'next'; |
| 1133 | $op = $previous ? '<' : '>'; |
| 1134 | $order = $previous ? 'DESC' : 'ASC'; |
| 1135 | |
| 1136 | $join = apply_filters( "get_{$adjacent}_post_join", $join, $in_same_cat, $excluded_categories ); |
| 1137 | $where = apply_filters( "get_{$adjacent}_post_where", $wpdb->prepare("WHERE p.post_date $op %s AND p.post_type = %s AND p.post_status = 'publish' $posts_in_ex_cats_sql", $current_post_date, $post->post_type), $in_same_cat, $excluded_categories ); |
| 1138 | $sort = apply_filters( "get_{$adjacent}_post_sort", "ORDER BY p.post_date $order LIMIT 1" ); |
| 1139 | |
| 1140 | $query = "SELECT p.* FROM $wpdb->posts AS p $join $where $sort"; |
| 1141 | $query_key = 'adjacent_post_' . md5($query); |
| 1142 | $result = wp_cache_get($query_key, 'counts'); |
| 1143 | if ( false !== $result ) |
| 1144 | return $result; |
| 1145 | |
| 1146 | $result = $wpdb->get_row("SELECT p.* FROM $wpdb->posts AS p $join $where $sort"); |