集合分页

在laravel中通过模型查出的数据可以直接使用paginate()方法进行分页，但是如果直接使用集合是没有分页方法的，需要进行自定义操作
执行
> php artisan make:provider CollectionMacroServiceProvider

app/Provider目录下会自动chaun创建CollectionMacroServiceProvider.php文件

修改如下所示
```php
<?php

namespace App\Providers;

use Illuminate\Support\ServiceProvider;
//引入这几个类
use Illuminate\Pagination\Paginator;
use Illuminate\Pagination\LengthAwarePaginator;
use Illuminate\Support\Collection;

class CollectionMacroServiceProvider extends ServiceProvider
{
    /**
     * Bootstrap the application services.
     *
     * @return void
     */
    public function boot()
    {
        //
        if (!Collection::hasMacro('paginate')) {
            //注册宏
            Collection::macro('paginate',
                function ($perPage = 15, $page = null, $options = []) {
                    //获取当前页
                    $page = $page ?: (Paginator::resolveCurrentPage() ?: 1);
                    $results = $this->forPage($page, $perPage)->values();//对数据重新values索引，否则第二页会出现索引不对的情况
                    //初始化LengthAwarePaginator
                    return (new LengthAwarePaginator(
                        $results, $this->count(), $perPage, $page, $options))
                        ->withPath(url()->current());
                });
        }
    }

/**
     * Register the application services.
     *
     * @return void
     */
    public function register()
    {
        //
    }
}

```

在config/app.php的providers数组中加入一行注册provider
```php
App\Providers\CollectionMacroServiceProvider::class,
```

使用方法：
```php
collect([1,2,3,4,5,6])->paginate(5);
```

如果发现没生效的话执行：
> php artisan config:clear

binggo!
实例
对集合分页后重新排序
```php
       /**
     * 用户账单
     * 包括提币记录、充值记录、转账（出入记录）
     */
    public function bill()
    {
        $user = auth()->user();
        //提币记录
        $withdrawRecord = $user->with_draw_orders()->latest()->get();
        //前台充值提币记录（其他用户买了，给当前用户的返币）
        $returnCoinFrontRecord = $user->with_draw_orders()->latest()->get();
        //后台充值返币记录（其他用户买了，给当前用户的返币）
        $returnCoinBackRecord = $user->back_order_items()->latest()->get();
        //前台充值记录
        $FrontRechargeOrder = $user->orders()->latest()->get();
        //后台充值记录
        $BackendRechargeOrder = $user->system_recharge()->latest()->get();
        //转出记录
        $TransferOutOrder = $user->transfer_out()->get()->each(function ($item, $key) {
            $item->bill_type = BillTypeService::TYPE_TRANSFER_OUT;
            $item->phone = $item->user_in->phone;
        });
        //转入记录
        $TransferInOrder = $user->transfer_in()->get()->each(function ($item, $key) {
            $item->bill_type = BillTypeService::TYPE_TRANSFER_IN;
            $item->phone = $item->user_out->phone;
        });
        $collect = collect($withdrawRecord);
        $collect = $collect->merge($returnCoinFrontRecord);
        $collect = $collect->merge($returnCoinBackRecord);
        $collect = $collect->merge($FrontRechargeOrder);
        $collect = $collect->merge($BackendRechargeOrder);
        $collect = $collect->merge($TransferOutOrder);
        $collect = $collect->merge($TransferInOrder);
        $collect = $collect->sortByDesc('created_at');//重新排序
        $collect = $collect->paginate(2);
        return $this->successResponseCollect(BillResource::collection($collect));
    }
```
参考：
[Laravel给集合分页](https://hzlianye.com/2018/07/27/Laravel%E7%BB%99%E9%9B%86%E5%90%88%E5%88%86%E9%A1%B5/ "Laravel给集合分页")

[laravel 添加自定義 Provider 配置之後不生效的問題](https://hk.saowen.com/a/b15478cd8208e155e5eb4131ea55ae6c8dc1191adfc069f5b2374b6b348be93f "laravel 添加自定義 Provider 配置之後不生效的問題")

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