php中如何获取数据

<?php
/**
 * Created by PhpStorm.
 * User: yuyi
 * Date: 2018/4/27
 * Time: 16:21
 */
/**
 * Class myBase
 */
class myBase
{
    public function __construct()
    {
    }
    public function getData()
    {
        return [1, 2];
    }
}
/**
 * Class Filter1
 * @property myBase $next
 */
class Filter1
{
    private $_next;
    public function __construct($next)
    {
        $this->_next = $next;
    }
    public function getData()
    {
        $data = $this->_next->getData();
        //TODO
        array_pop($data);
        return $data;
    }
}
class Filter2
{
    private $_next;
    public function __construct($next)
    {
        $this->_next = $next;
    }
    public function getData()
    {
        $data = $this->_next->getData();
        //TODO
        $data[] = 5;
        return $data;
    }
}
$b = new myBase();
$b = new Filter1($b);
//$b = new Filter2($b);
var_dump($b->getData());

php中如何获取数据

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