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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 |
|---|---|
| 569 | $posts_in_ex_cats_sql = " AND tt.taxonomy = 'category' AND tt.term_id NOT IN (" . implode($excluded_categories, ',') . ')'; |
| 570 | } |
| 571 | } |
| 572 | } |
| 573 | |
| 574 | $adjacent = $previous ? 'previous' : 'next'; |
| 575 | $op = $previous ? '<' : '>'; |
| 576 | $order = $previous ? 'DESC' : 'ASC'; |
| 577 | |
| 578 | $join = apply_filters( "get_{$adjacent}_post_join", $join, $in_same_cat, $excluded_categories ); |
| 579 | $where = apply_filters( "get_{$adjacent}_post_where", $wpdb->prepare("WHERE p.post_date $op %s AND p.post_type = 'post' AND p.post_status = 'publish' $posts_in_ex_cats_sql", $current_post_date), $in_same_cat, $excluded_categories ); |
| 580 | $sort = apply_filters( "get_{$adjacent}_post_sort", "ORDER BY p.post_date $order LIMIT 1" ); |
| 581 | |
| 582 | return $wpdb->get_row("SELECT p.* FROM $wpdb->posts AS p $join $where $sort"); |
| 583 | } |
| 584 | |
| 585 | function previous_post_link($format='« %link', $link='%title', $in_same_cat = false, $excluded_categories = '') { |
| 586 | adjacent_post_link($format, $link, $in_same_cat, $excluded_categories, true); |
| 587 | } |