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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 |
|---|---|
| 410 | $sql_exclude_cats = ''; |
| 411 | if ( !empty($excluded_categories) ) { |
| 412 | $blah = explode(' and ', $excluded_categories); |
| 413 | $posts_in_ex_cats = get_objects_in_term($blah, 'category'); |
| 414 | $posts_in_ex_cats_sql = 'AND p.ID NOT IN (' . implode($posts_in_ex_cats, ',') . ')'; |
| 415 | } |
| 416 | |
| 417 | $join = apply_filters( 'get_next_post_join', $join, $in_same_cat, $excluded_categories ); |
| 418 | $where = apply_filters( 'get_next_post_where', "WHERE p.post_date > '$current_post_date' AND p.post_type = 'post' AND p.post_status = 'publish' $posts_in_ex_cats_sql AND p.ID != $post->ID", $in_same_cat, $excluded_categories ); |
| 419 | $sort = apply_filters( 'get_next_post_sort', 'ORDER BY p.post_date ASC LIMIT 1' ); |
| 420 | |
| 421 | return @$wpdb->get_row("SELECT p.ID, p.post_title FROM $wpdb->posts AS p $join $where $sort"); |
| 422 | } |
| 423 | |
| 424 | |
| 425 | function previous_post_link($format='« %link', $link='%title', $in_same_cat = false, $excluded_categories = '') { |
| 426 | |
| 427 | if ( is_attachment() ) |
| 428 | $post = & get_post($GLOBALS['post']->post_parent); |