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Source View: get_next_post_join

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Understanding Source Code

The best way to understand what a hook does is to look at where it occurs in the source code.

  • Action hooks look like this: do_action( "hook_name" )
  • Filter hooks look like this: 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.

Source View

Line Code
327           $blah = explode(' and ', $excluded_categories);
328           foreach ( $blah as $category ) {
329                $category = intval($category);
330                $sql_cat_ids = " OR pc.category_ID = '$category'";
331           }
332           $posts_in_ex_cats = $wpdb->get_col("SELECT p.ID from $wpdb->posts p LEFT JOIN $wpdb->post2cat pc ON pc.post_id = p.ID WHERE 1 = 0 $sql_cat_ids GROUP BY p.ID");
333           $posts_in_ex_cats_sql = 'AND ID NOT IN (' . implode($posts_in_ex_cats, ',') . ')';
334      }
335
336      $join  = apply_filters( 'get_next_post_join', $join, $in_same_cat, $excluded_categories );
337      $where = apply_filters( 'get_next_post_where', "WHERE post_date > '$current_post_date' AND post_type = 'post' AND post_status = 'publish' $posts_in_ex_cats_sql AND ID != $post->ID", $in_same_cat, $excluded_categories );
338      $sort  = apply_filters( 'get_next_post_sort', 'ORDER BY post_date ASC LIMIT 1' );
339
340      return @$wpdb->get_row("SELECT ID, post_title FROM $wpdb->posts $join $where $sort");
341 }
342
343
344 function previous_post_link($format='« %link', $link='%title', $in_same_cat = false, $excluded_categories = '') {
345