public function whereEqual($field, $param, string $op = ''): self
    {
        return $this->where($this->prepareField($field) .' = ?', $param, $op);
    }
public function whereEqual($field, $param, string $op = ''): self
    {
        return $this->where($this->prepareField($field) .' = ?', $param, $op);
    }
public function whereEqual ( $ field , $ param , string $ op = '' ) : self { return $ this -> where ( $ this -> prepareField ( $ field ) . ' = ?' , $ param , $ op ) ; }
Where equal.
@param  string|array|Builder $field
@param  any                  $param
@param  string               $op
@return self
Where equal .