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使用场景：

Laravel为Eloquent的集合提供了开箱即用的分页，但不能在普通集合上使用它。集合有forPage()方法，但它的级别更低，因此它不生成分页链接。因此，您必须创建一个LengthAwarePaginator实例。但是，如果您希望与Eloquent的集合相同呢?然后使用macro!

这样做的好处是，语法和输出几乎与Eloquent集合paginate()方法相同，因此在测试时可以(相对地)轻松地将其替换为Eloquent集合。

有两种方法：

1. 使用

macro


可以将集合

macro

添加到服务提供程序。这样就可以对任何集合调用paginate()

collect([ ... ])->paginate( 20 );

2. The subclass way

Where you want a “pageable” collection that is distinct from the standard

Illuminate\Support\Collection

, implement a copy of

Collection.php

in your application and simply replace your

use Illuminate\Support\Collection

statements at the top of your dependent files with

use App\Support\Collection

:

// use Illuminate\Support\Collection
use App\Support\Collection;

$items = [];
$collection = (new Collection($items))->paginate(20);

注意，此方法不能与collect()助手函数一起使用

AppServiceProvider.php

<?php

namespace App\Providers;

use Illuminate\Support\Collection;
use Illuminate\Pagination\LengthAwarePaginator;

class AppServiceProvider extends ServiceProvider
{
    public function boot()
    {
        /**
         * Paginate a standard Laravel Collection.
         *
         * @param int $perPage
         * @param int $total
         * @param int $page
         * @param string $pageName
         * @return array
         */
        Collection::macro('paginate', function($perPage, $total = null, $page = null, $pageName = 'page') {
            $page = $page ?: LengthAwarePaginator::resolveCurrentPage($pageName);

            return new LengthAwarePaginator(
                $this->forPage($page, $perPage)->values(),
                $total ?: $this->count(),
                $perPage,
                $page,
                [
                    'path' => LengthAwarePaginator::resolveCurrentPath(),
                    'pageName' => $pageName,
                ]
            );
        });
    }
}

Collection.php

<?php

namespace App\Support;

use Illuminate\Pagination\LengthAwarePaginator;
use Illuminate\Support\Collection as BaseCollection;

class Collection extends BaseCollection
{
    public function paginate($perPage, $total = null, $page = null, $pageName = 'page')
    {
        $page = $page ?: LengthAwarePaginator::resolveCurrentPage($pageName);
      
        return new LengthAwarePaginator(
            $this->forPage($page, $perPage)->values(),
            $total ?: $this->count(),
            $perPage,
            $page,
            [
                'path' => LengthAwarePaginator::resolveCurrentPath(),
                'pageName' => $pageName,
            ]
        );
    }
}