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library/think/Collection.php

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+<?php
+// +----------------------------------------------------------------------
+// | ThinkPHP [ WE CAN DO IT JUST THINK ]
+// +----------------------------------------------------------------------
+// | Copyright (c) 2006~2016 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
+{
+    protected $items = [];
+
+    public function __construct($items = [])
+    {
+        $this->items = $items instanceof self ? $items->all() : (array)$items;
+    }
+
+    public static function make($items = [])
+    {
+        return new static($items);
+    }
+
+    /**
+     * 是否为空
+     * @return bool
+     */
+    public function isEmpty()
+    {
+        return empty($this->items);
+    }
+
+    public function toArray()
+    {
+        return array_map(function ($value) {
+            return ($value instanceof Model || $value instanceof self) ? $value->toArray() : $value;
+        }, $this->items);
+    }
+
+    public function all()
+    {
+        return $this->items;
+    }
+
+    /**
+     * 截取数组
+     *
+     * @param  int $offset
+     * @param  int $length
+     * @param  bool $preserveKeys
+     * @return static
+     */
+    public function slice($offset, $length = null, $preserveKeys = false)
+    {
+        return new static(array_slice($this->items, $offset, $length, $preserveKeys));
+    }
+
+    // ArrayAccess
+    public function offsetExists($offset)
+    {
+        return array_key_exists($offset, $this->items);
+    }
+
+    public function offsetGet($offset)
+    {
+        return $this->items[$offset];
+    }
+
+    public function offsetSet($offset, $value)
+    {
+        if (is_null($offset)) {
+            $this->items[] = $value;
+        } else {
+            $this->items[$offset] = $value;
+        }
+    }
+
+    public function offsetUnset($offset)
+    {
+        unset($this->items[$offset]);
+    }
+
+    //Countable
+    public function count()
+    {
+        return count($this->items);
+    }
+
+    //IteratorAggregate
+    public function getIterator()
+    {
+        return new ArrayIterator($this->items);
+    }
+
+    //JsonSerializable
+    public function jsonSerialize()
+    {
+        return $this->toArray();
+    }
+
+    /**
+     * 转换当前数据集为JSON字符串
+     * @access public
+     * @param integer $options json参数
+     * @return string
+     */
+    public function toJson($options = JSON_UNESCAPED_UNICODE)
+    {
+        return json_encode($this->toArray(), $options);
+    }
+
+    public function __toString()
+    {
+        return $this->toJson();
+    }
+}