20-过滤器模式.php

<?php

declare(strict_types=1);

/*
 * This file is modified from `xiaohuangniu/26`.
 *
 * @see https://github.com/xiaohuangniu/26
 */

header('Content-type: text/html; charset=utf-8');

/**
 * 接口 - 过滤器.
 */
interface Filter
{
    public function Go($person); // 过滤方法 - 参数是一个存储了对象列表的数组
}

/**
 * 具体化 - 过滤器 - 按性别过滤对象
 */
class Gender implements Filter
{
    private $_gender; // 过滤条件

    public function __construct($gender)
    {
        $this->_gender = $gender;
    }

    // 实现过滤方法
    public function Go($person)
    {
        foreach ($person as $k => $v) {
            if ($v->gender === $this->_gender) {
                $personsFilter[] = $person[$k];
            }
        }

        return $personsFilter;
    }
}

/**
 * 具体化 - 过滤器 - 按运动类型过滤对象
 */
class SportType implements Filter
{
    private $_sportType; // 过滤条件

    public function __construct($sportType)
    {
        $this->_sportType = $sportType;
    }

    // 实现过滤方法
    public function Go($person)
    {
        foreach ($person as $k => $v) {
            if ($v->sportType === $this->_sportType) {
                $personsFilter[] = $person[$k];
            }
        }

        return $personsFilter;
    }
}

/**
 * 运动类.
 */
class Motion
{
    public $gender; // 性别

    public $sportType; // 运动类型

    public function __construct($gender, $sportType)
    {
        $this->gender = $gender;
        $this->sportType = $sportType;
    }
}

// 定义一组对象列表
$persons = [];
$persons[] = new Motion('男', '篮球');
$persons[] = new Motion('女', '游泳');
$persons[] = new Motion('男', '羽毛球');
$persons[] = new Motion('女', '篮球');
$persons[] = new Motion('男', '游泳');
$persons[] = new Motion('女', '羽毛球');
// 按过滤男性
$filterGender = new Gender('男');
echo '<pre>';
var_dump($filterGender->Go($persons));
echo '</pre>';

// 过滤运动项目篮球
$filterSportType = new SportType('游泳');
echo '<pre>';
var_dump($filterSportType->Go($persons));
echo '</pre>';