vendor/illuminate/support/Collection.php

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<?php

namespace Illuminate\Support;

use stdClass;
use Countable;
use Exception;
use ArrayAccess;
use Traversable;
use ArrayIterator;
use CachingIterator;
use JsonSerializable;
use IteratorAggregate;
use Illuminate\Support\Traits\Macroable;
use Illuminate\Contracts\Support\Jsonable;
use Symfony\Component\VarDumper\VarDumper;
use Illuminate\Contracts\Support\Arrayable;

/**
 * @property-read HigherOrderCollectionProxy $average
 * @property-read HigherOrderCollectionProxy $avg
 * @property-read HigherOrderCollectionProxy $contains
 * @property-read HigherOrderCollectionProxy $each
 * @property-read HigherOrderCollectionProxy $every
 * @property-read HigherOrderCollectionProxy $filter
 * @property-read HigherOrderCollectionProxy $first
 * @property-read HigherOrderCollectionProxy $flatMap
 * @property-read HigherOrderCollectionProxy $groupBy
 * @property-read HigherOrderCollectionProxy $keyBy
 * @property-read HigherOrderCollectionProxy $map
 * @property-read HigherOrderCollectionProxy $max
 * @property-read HigherOrderCollectionProxy $min
 * @property-read HigherOrderCollectionProxy $partition
 * @property-read HigherOrderCollectionProxy $reject
 * @property-read HigherOrderCollectionProxy $sortBy
 * @property-read HigherOrderCollectionProxy $sortByDesc
 * @property-read HigherOrderCollectionProxy $sum
 * @property-read HigherOrderCollectionProxy $unique
 */
class Collection implements ArrayAccess, Arrayable, Countable, IteratorAggregate, Jsonable, JsonSerializable
{
    use Macroable;

    /**
     * The items contained in the collection.
     *
     * @var array
     */
    protected $items = [];

    /**
     * The methods that can be proxied.
     *
     * @var array
     */
    protected static $proxies = [
        'average', 'avg', 'contains', 'each', 'every', 'filter', 'first',
        'flatMap', 'groupBy', 'keyBy', 'map', 'max', 'min', 'partition',
        'reject', 'some', 'sortBy', 'sortByDesc', 'sum', 'unique',
    ];