php - mysql object not converting to int -

so, have wp mysql db column following:

`update_number` =  int(11) null:no, default:0 

then have following php:

$rss_update = $wpdb->get_results("select update_number $table sub_id = $post_id"); if ( $rss_update ) {     foreach ( $rss_update $rss_single )     {         $rss_row_new  = $rss_single + 1;                     $wpdb->update($table, array('update_number' => $rss_row_new),array( 'sub_id' => $post_id ));         }    } 

so idea that, results sub_id = $post_id, update_number. (ie. "0,2,1,4,2,2")

then, each value, want increase integer value +1 , update it.

however, getting object of class stdclass not converted int.

what doing wrong?

i think need ensure $rss_single string or int

var_dump($rss_single);exit;

$rss_update = $wpdb->get_results("select update_number $table sub_id = $post_id");  if ( $rss_update )  {      foreach ( $rss_update $rss_single )      {          $rss_row_new  = $rss_single->update_number + 1;                      $wpdb->update($table, array('update_number' => $rss_row_new),array( 'sub_id' => $post_id ));          }     }