core/library/think/Collection.php

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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2018 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: zhangyajun <448901948@qq.com>
// +----------------------------------------------------------------------

namespace think;

use ArrayAccess;
use ArrayIterator;
use Countable;
use IteratorAggregate;
use JsonSerializable;

class Collection implements ArrayAccess, Countable, IteratorAggregate, JsonSerializable
{
    /**
     * @var array 数据
     */
    protected $items = [];

    /**
     * Collection constructor.
     * @access public
     * @param  array $items 数据
     */
    public function __construct($items = [])
    {
        $this->items = $this->convertToArray($items);
    }

    /**
     * 创建 Collection 实例
     * @access public
     * @param  array $items 数据
     * @return static
     */
    public static function make($items = [])
    {
        return new static($items);
    }

    /**
     * 判断数据是否为空
     * @access public
     * @return bool
     */
    public function isEmpty()
    {
        return empty($this->items);
    }

    /**
     * 将数据转成数组
     * @access public