public function where(
        $column,
        $operator = null,
        $value = null,
        $boolean = 'and'
    ) {
        if (is_array($column)) {
            $this->_where = $column;
        }

        return $this;
    }
public function where(
        $column,
        $operator = null,
        $value = null,
        $boolean = 'and'
    ) {
        if (is_array($column)) {
            $this->_where = $column;
        }

        return $this;
    }
public function where ( $ column , $ operator = null , $ value = null , $ boolean = 'and' ) { if ( is_array ( $ column ) ) { $ this -> _where = $ column ; } return $ this ; }
Set where conditions

@param  [type] $column
@param  [type] $operator
@param  [type] $value
@param  string $boolean
@return [type]
Set where conditions