vendor/topthink/think-helper/src/helper/Arr.php

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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2015 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: yunwuxin <448901948@qq.com>
// +----------------------------------------------------------------------

namespace think\helper;

use ArrayAccess;
use InvalidArgumentException;
use think\Collection;

class Arr
{

    /**
     * Determine whether the given value is array accessible.
     *
     * @param mixed $value
     * @return bool
     */
    public static function accessible($value)
    {
        return is_array($value) || $value instanceof ArrayAccess;
    }

    /**
     * Add an element to an array using "dot" notation if it doesn't exist.
     *
     * @param array  $array
     * @param string $key
     * @param mixed  $value
     * @return array
     */
    public static function add($array, $key, $value)
    {
        if (is_null(static::get($array, $key))) {
            static::set($array, $key, $value);
        }

        return $array;
    }

    /**
     * Collapse an array of arrays into a single array.
     *
     * @param array $array
     * @return array
     */
    public static function collapse($array)
    {
        $results = [];

        foreach ($array as $values) {
            if ($values instanceof Collection) {