PHP design pattern factory pattern_PHP tutorial-PHP Tutorial-php.cn

PHP design pattern factory pattern_PHP tutorial

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Release： 2016-07-20 11:14:33

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Factory mode:The factory class determines which instance of the production class to create based on the parameters Factory class:A method class specifically used to create other objects. That is, allocate on demand, pass in parameters for selection, and return the specific class. Function: Encapsulates object creation and simplifies the operation of creating objects, that is, calling a method of the factory class to get the required class Supplement: 1. Main roles: abstract product (Product), concrete product (Concrete Product), abstract factory role (Creator) 2. Advantages and Disadvantages Advantages: The factory method pattern allows the system to introduce new products without modifying the factory role. Disadvantages: Customers may have to create a Creator subclass just to create a specific Concrete Product object 3. Applicability When a class does not know the objects it must create When a class wants its subclasses to specify the objects it creates When a class delegates the responsibility of creating objects to one of multiple helper subclasses and wants you to localize the information about which helper subclass is the delegate

<?php
//对象
class MyObject{
    public function __construct(){}
    public function test(){
        return 'test';
    }
}
//工厂
class MyFactory{
    public static function factory(){
        return new MyObject();
    }
}

$myObject = MyFactory::factory();
echo $myObject->test();
?>

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<?php
//抽象类 定义属性及抽象方法
abstract class Operation{
    protected $_NumberA = 0;
    protected $_NumberB = 0;
    protected $_Result= 0;
    
    public function __construct($A,$B){
        $this->_NumberA = $A;
        $this->_NumberB = $B;
    }

    public function setNumber($A,$B){
        $this->_NumberA = $A;
        $this->_NumberB = $B;
    }

    public function clearResult(){
        $this->_Result = 0;
    }

    abstract protected function getResult();
}

//操作类
class OperationAdd extends Operation{
    public function getResult(){
        $this->_Result = $this->_NumbserA + $this->_NumberB;
        return $this->_Result;
    }
}

class OperationSub extends Operation{
    public function getResult(){
        $this->_Result = $this->_NumberA - $this->_NumberB;
        return $this->_Result;
    }
}
&hellip;&hellip;&hellip;&hellip;

//工厂类
class OperationFactory{
    private static $obj;
    
    public static function CreationOperation($type,$A,$B){
        switch($type){
            case '+':
                self::$obj = new OperationAdd($A,$B);
                break;
            case '-':
                self::$obj = new OperationSub($A,$B);
                break;
            &hellip;&hellip;
        }
    }
}

//操作
$obj = OperationFactory:: CreationOperation('+',5,6);
echo $obj-> getResult();
?>

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