PHP 状态类

<?php

class State
{
    /**
     * @var string 数据库的字段状态值
     */
    private $state;

    public $delegate;

    public function __construct($object, $state) {
        $this->delegate = $object;
        $this->ensureIsValidState($state);
    }

    public function getStateList() {
        return $this->delegate->getStateList();
    }

    private function ensureIsValidState($state) {
        if (!array_key_exists($state, $this->getStateList())) {
            throw new \InvalidArgumentException('Invalid state given parameter');
        }
        $this->state = $state;
    }

    /**
     * 获取英文名
     * @return string
     */
    public function name() {
        $state_list = $this->getStateList();
        return key($state_list[$this->state]);
    }

    //将不同的状态业务逻辑放对应的类文件中处理
    public function createObject() {
        $object = get_class($this->delegate) . ucfirst($this->name()) . "State";
        return new $object;
    }

    /**
     * 获取中文名
     * @return string
     */
    private function display() {
        $state_list = $this->getStateList();
        return $state_list[$this->state][$this->name()];
    }

    public function __toString() {
        return $this->display();
    }
}

  代理模式，状态模式。 调用

<?php

class Orders
{
    const STATE_CREATED = 1;
    const STATE_CLOSED = 2;
    /**
     * @var array
     */
    public static $validStates = [
        self::STATE_CREATED => ['created' => '创建'],
        self::STATE_CLOSED => ['closed' => '关闭'],
    ];

    public static function getStatus() {
        return new State(new self, 1);
    }

    public function getStateList() {
        return static::$validStates;
    }
}

echo Orders::getStatus()->name();
echo Orders::getStatus()->createObject();