PHP - Foreach Object

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<?php

/**
 * Class Test.
 */
class Test implements Iterator {

  /**
   * @var array
   */
  private $array;

  /**
   * 构造器
   * @param array $array 初始化数组
   */
  public function __construct($array = []) {
    $this->array = $array;
  }

  /**
   * 重置指针
   */
  public function rewind() {
    reset($this->array);
  }

  /**
   * 验证
   */
  public function valid() {
    return ($this->current() !== false);
  }

  /**
   * 获取当前 value
   */
  public function current() {
    return current($this->array);
  }

  /**
   * 获取当前 key
   */
  public function key() {
    return key($this->array);
  }

  /**
   * 指针下移
   */
  public function next() {
    return next($this->array);
  }

}

// 测试
$array = new Test(['one', 'two', 'three', 'my' => 'Oscaner']);

foreach ($array as $k => $v) {
  echo "{$k} => {$v}\n";
}