【php设计模式】策略模式

<?php
interface Stratege{
    public function doOperation($int1,$int2);
}

class OperationAdd implements Stratege{
    public function doOperation($int1,$int2){
        return $int1 + $int2;
    }
}

class OperationSub implements Stratege{
    public function doOperation($int1,$int2){
        return $int1 - $int2;
    }
}

class Context{
    public $stratege;
    public function __construct(Stratege $stra){
        $this->stratege = $stra;
    }
    public function executeStrategy($int1,$int2){
        echo $this->stratege->doOperation($int1,$int2)."\n";
    }
}


$add = new OperationAdd();
$context_add = new Context($add);
$context_add->executeStrategy(5,3); //输出8

$sub = new OperationSub();
$context_sub = new Context($sub);
$context_sub->executeStrategy(5,3); //输出2