Source View: get_previous_post_where

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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
335           foreach ( $blah as $category ) {
336                $category = intval($category);
337                $sql_cat_ids = " OR pc.category_ID = '$category'";
338           }
339           $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");
340           $posts_in_ex_cats_sql = 'AND ID NOT IN (' . implode($posts_in_ex_cats, ',') . ')';
341      }
342
343      $join  = apply_filters( 'get_previous_post_join', $join, $in_same_cat, $excluded_categories );
344      $where = apply_filters( 'get_previous_post_where', "WHERE post_date < '$current_post_date' AND post_type = 'post' AND post_status = 'publish' $posts_in_ex_cats_sql", $in_same_cat, $excluded_categories );
345      $sort  = apply_filters( 'get_previous_post_sort', 'ORDER BY post_date DESC LIMIT 1' );
346
347      return @$wpdb->get_row("SELECT ID, post_title FROM $wpdb->posts $join $where $sort");
348 }
349
350 function get_next_post($in_same_cat = false, $excluded_categories = '') {
351      global $post, $wpdb;
352
353      if( !is_single() || is_attachment() )