Illuminate\Database\Query\Builder::orWhereNull PHP Method

    public function orWhereNull($column)
    {
        return $this->whereNull($column, 'or');
    }

 /**
  * Add an "or where null" clause to the query.
  *
  * @param string $column
  * @return \Illuminate\Database\Query\Builder|static 
  * @static 
  */
 public static function orWhereNull($column)
 {
     return \Illuminate\Database\Query\Builder::orWhereNull($column);
 }