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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 |
|---|---|
| 375 | } |
| 376 | |
| 377 | $sql_exclude_cats = ''; |
| 378 | if ( !empty($excluded_categories) ) { |
| 379 | $blah = explode(' and ', $excluded_categories); |
| 380 | $posts_in_ex_cats = get_objects_in_term($blah, 'category'); |
| 381 | $posts_in_ex_cats_sql = 'AND p.ID NOT IN (' . implode($posts_in_ex_cats, ',') . ')'; |
| 382 | } |
| 383 | |
| 384 | $join = apply_filters( 'get_previous_post_join', $join, $in_same_cat, $excluded_categories ); |
| 385 | $where = apply_filters( 'get_previous_post_where', "WHERE p.post_date < '$current_post_date' AND p.post_type = 'post' AND p.post_status = 'publish' $posts_in_ex_cats_sql", $in_same_cat, $excluded_categories ); |
| 386 | $sort = apply_filters( 'get_previous_post_sort', 'ORDER BY p.post_date DESC LIMIT 1' ); |
| 387 | |
| 388 | return @$wpdb->get_row("SELECT p.ID, p.post_title FROM $wpdb->posts AS p $join $where $sort"); |
| 389 | } |
| 390 | |
| 391 | function get_next_post($in_same_cat = false, $excluded_categories = '') { |
| 392 | global $post, $wpdb; |
| 393 | |