Someone

    $board_config = array('seo_rank_google'=>'2006-01 2','seo_rank_google'=>'2006-01 9');

    // assign the arrays
    $google_arr = array();

    // Go through each value in board_config,
    foreach ( $board_config as $key => $value )
      {

        // if they have the seo string -
        // $board_config['seo_rank_google'] => '2006-01 1'
        if (stristr($key,'seo_rank_google'))
          {
            // explode them and put them into array
            $seo=explode(' ',$value);
            $google_arr[] = $seo[1];

          }

      }