策略模式

/**
* 策略抽象类 规定策略名称
*/
abstract class strategy {
abstract function operating();
}
/**
* 第一个策略
*/
class strategy_1 extends strategy {
public function operating() {
echo '第一个策略';
}
}
/**
* 第二个策略
*/
class strategy_2 extends strategy {
public function operating() {
echo'第二个策略';
}
}

/**
* 策略生成器
*/
class strategy_context {
private $strategy;
public function __construct($num) {
//根据不同的条件生成不同的策略
if($num == 1) {
$this->strategy = new strategy_1();
}else{
$this->strategy = new strategy_2();
}
}
public function operating() {
return $this->strategy->operating();
}
}

$strategy_context = new strategy_context(1);
$strategy_context->operating();