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   getMessage();        }    }}//类的实例化$test = new calc();echo '+ ='.$test->calculate(100,99,'+');echo "
";echo '- ='.$test->calculate(100,99,'-');echo "
";echo '* ='.$test->calculate(100,99,'*');echo "
";echo '/ ='.$test->calculate(100,99,'/');echo "
";echo '/ ='.$test->calculate(100,0,'/');echo "
";echo '% ='.$test->calculate(100,99,'%');echo "
";

工厂模式：

echo "
   
";//接口interface calc1{    public function getValue($num1,$num2);}//加法，继承接口并实现class math_add implements calc1{    public function getValue($num1, $num2)    {        return $num1 + $num2;    }}//减法class math_sub implements calc1{    public function getValue($num1, $num2)    {        return $num1 - $num2;    }}//乘法class math_mul implements calc1{    public function getValue($num1, $num2)    {        return $num1 * $num2;    }}//除法class math_div implements calc1{    public function getValue($num1, $num2)    {        try        {            if($num2 == 0)            {                throw new Exception('chu shu bu meng wei 0');            }            else            {                return $num1 / $num2;            }        }        catch (Exception $e)        {            echo "wrong :".$e->getMessage();        }    }}//工厂类，静态方法创建对象class factory1{    public static function createObject($operator)    {        switch ($operator)        {            case '+':                return new math_add();                break;            case '-':                return new math_sub();                break;            case '*':                return new math_mul();                break;            case '/':                return new math_div();                break;        }    }}//创建加法类实例$fac1 = factory1::createObject('+');echo '+ ='.$fac1->getValue(100,99);echo "
";//创建减法类实例$fac2 = factory1::createObject('-');echo '- ='.$fac2->getValue(100,99);echo "
";//创建乘法类实例$fac3 = factory1::createObject('*');echo '* ='.$fac3->getValue(100,99);echo "
";//创建除法类实例$fac4 = factory1::createObject('/');echo '/ ='.$fac4->getValue(100,99);echo "
";//除数为0$fac5 = factory1::createObject('/');echo '+ ='.$fac5->getValue(100,0);echo "
";