protected function getExpression($equation)
    {
        if ($this->fixedVerifyCode !== null) {
            return $this->fixedVerifyCode;
        }
		
		return $equation['first'] ."~". $equation['operator'] ."~". $equation['second'] ."~=";
    }
protected function getExpression($equation)
    {
        if ($this->fixedVerifyCode !== null) {
            return $this->fixedVerifyCode;
        }
		
		return $equation['first'] ."~". $equation['operator'] ."~". $equation['second'] ."~=";
    }
protected function getExpression ( $ equation ) { if ( $ this -> fixedVerifyCode !== null ) { return $ this -> fixedVerifyCode ; } return $ equation [ 'first' ] . "~" . $ equation [ 'operator' ] . "~" . $ equation [ 'second' ] . "~=" ; }
Get expresion formula .
@param array $equation
@return string
Get expresion formula .