PHP设计模式：策略模式

#UserStrategy.php 用户策略

<?php

namespace celvmoshi;

/**用户策略接口
* Interface UserStategy
* @package celvmoshi
*/
interface UserStrategy
{
//显示广告
public function showAd();

//显示分类
public function showCategory();

}

#FemaleStrategy.php 女性用户策略
<?php
namespace celvmoshi;

/**女性用户策略
* Class FemaleStrayegy
* @package celvmoshi
*/
class FemaleStrategy implements UserStrategy
{
public function showAd()
{
echo "2017 新潮女装\r\n";
}

public function showCategory()
{
echo "服装\r\n";
}
}

#MaleStrategy.php 男性用户策略

<?php
namespace celvmoshi;

/**男性用户策略
* Class MaleStrayegy
* @package celvmoshi
*/

class MaleStrategy implements UserStrategy
{
//显示广告
public function showAd()
{
echo "新款宝马X6\r\n";
}

//显示分类
public function showCategory()
{
echo "小汽车\r\n";
}
}

#index.php 默认业务访问入口

<?php
define('ROOT', __DIR__ . '/');

//实现自动加载
spl_autoload_register('autoload');
function autoload($className)
{
$arr = explode('\\', $className);
require_once ROOT . ucfirst($arr[1]) . '.php';
}

class Page
{
protected $strategy;//显示策略

public function index()
{
echo "显示广告：";
$this->strategy->showAd();

echo "<hr>";

echo "显示分类：";
$this->strategy->showCategory();

}

//设置显示策略
public function setStrategy(celvmoshi\UserStrategy $strategy)//(约定接口类型)
{
$this->strategy = $strategy;
}
}

$page = new Page();
if (isset($_GET['female'])) {
$userStrategy = new celvmoshi\FemaleStrategy();
} else if (isset($_GET['male'])) {
$userStrategy = new celvmoshi\MaleStrategy();
} else {
return;
}

$page->setStrategy($userStrategy);
$page->index();