PHP设计模式-过滤器
适用性
允许我们使用不同的规则过滤某一组对象
代码示例
/**
* 过滤接口
*/
interface FilterInterface
{
/**
* 过滤方法
*
* @param SportsMan $person 运动员
* @return mixed
*/
public function filter(array $person);
}
/**
* 按运动项目过滤实体
*/
class SportsPerson
{
/**
* 性别
* @var string
*/
private $_gender = '';
/**
* 按照本运动项目过滤
* @var string
*/
private $_sportType = '';
/**
* 构造函数
* @param string $gender
* @param string $sportType
*/
public function __construct($gender='', $sportType='')
{
$this->_gender = $gender;
$this->_sportType = $sportType;
}
/**
* 魔法函数
* @param string $value
* @return mixed
*/
public function __get($value='')
{
$value = '_' . $value;
return $this->$value;
}
}
/**
* 按性别过滤实体
*/
class FilterGender implements FilterInterface
{
/**
* 按照本性别过滤
* @var string
*/
private $_gender = '';
/**
* 构造函数
* @param string $gender
*/
public function __construct($gender='')
{
$this->_gender = $gender;
}
/**
* 过滤方法
*
* @param array $persons 运动员集合
* @return mixed
*/
public function filter(array $persons)
{
foreach ($persons as $k => $v) {
if ($v->gender === $this->_gender) {
$personsFilter[] = $persons[$k];
}
}
return $personsFilter;
}
}
/**
* 按运动项目过滤实体
*/
class FilterSportType implements FilterInterface
{
/**
* 按照本运动项目过滤
* @var string
*/
private $_sportType = '';
/**
* 构造函数
* @param string $sportType
*/
public function __construct($sportType='')
{
$this->_sportType = $sportType;
}
/**
* 过滤方法
*
* @param array $persons 运动员集合
* @return mixed
*/
public function filter(array $persons)
{
foreach ($persons as $k => $v) {
if ($v->sportType === $this->_sportType) {
$personsFilter[] = $persons[$k];
}
}
return $personsFilter;
}
}
try {
// 定义一组运动员
$persons = [];
echo '<pre/>';
$persons[] = new SportsPerson('male', 'basketball');
$persons[] = new SportsPerson('female', 'basketball');
$persons[] = new SportsPerson('male', 'football');
$persons[] = new SportsPerson('female', 'football');
$persons[] = new SportsPerson('male', 'swim');
$persons[] = new SportsPerson('female', 'swim');
// 按过滤男性
$filterGender = new FilterGender('male');
var_dump($filterGender->filter($persons));
// 过滤运动项目篮球
$filterSportType = new FilterSportType('basketball');
var_dump($filterSportType->filter($persons));
} catch (\Exception $e) {
echo $e->getMessage();
}
