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PHP policy mode

Source: Internet
Author: User
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<?PHP//PHP Policy Mode         Interfacemath{ Public functionCalc$op 1,$op 2); }         classMathaddImplementsmath{ Public functionCalc$op 1,$op 2){             return $op 1+$op 2; }         }          classMathsubImplementsmath{ Public functionCalc$op 1,$op 2){             return $op 1-$op 2; }         }          classMathmulImplementsmath{ Public functionCalc$op 1,$op 2){             return $op 1*$op 2; }         }          classMathdivImplementsmath{ Public functionCalc$op 1,$op 2){             return $op 1/$op 2; }         }//encapsulating a virtual machine      classcmath{protected $calc=NULL;  Public function__construct ($type){                $calc= ' Math '.$type; $this->calc=New $calc(); }            Public functionCalc$op 1,$op 2){            return   $this->calc->calc ($op 1,$op 2); }      }    $type=$_post[' Op ']; $cmath=NewCmath ($type); Echo  $cmath->calc ($_post[' OP1 '],$_post[' OP2 ']);
<!DOCTYPE HTML><HTMLLang= "en"><Head>    <MetaCharSet= "UTF-8">    <title>Policy mode</title></Head><Body>        <formAction= ' 2.php 'Method= "POST">             <inputtype= "text"name= "OP1">             <Selectname= "Op">                        <optionvalue= "Add">+</option>                        <optionvalue= "Sub">-</option>                        <optionvalue= "Mul">*</option>                        <optionvalue= "Div">/</option>               </Select>            <inputtype= "text"name= "OP2">            <P><inputtype= "Submit"name=""value= "Calculation"></P>        </form></Body></HTML>

The strategy mode implements simple calculator function

PHP policy mode

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