<?php

namespace Illuminate\Support;

/**
 * @template TKey
 * @template TValue
 * @implements \ArrayAccess<TKey, TValue>
 * @implements Enumerable<TKey, TValue>
 */
class Collection implements \ArrayAccess, Enumerable
{
    /**
     * The items contained in the collection.
     *
     * @var array<TKey, TValue>
     */
    protected $items = [];

    /**
     * Create a new collection.
     *
     * @param array<TKey, TValue> $items
     * @return void
     */
    public function __construct($items = []) {}

    /**
     * @param  callable|null  $callback
     * @param  mixed  $default
     * @return TValue|null
     */
    public function first(callable $callback = null, $default = null){}

    /**
     * @return static<TValue, TKey>
     */
    public function flip(){}

    /**
     * @param  callable|null  $callback
     * @param  mixed  $default
     * @return TValue|null
     */
    public function last(callable $callback = null, $default = null){}

    /**
     * @param  mixed  $key
     * @param  mixed  $default
     * @return TValue|null
     */
    public function get($key, $default = null) {}

    /**
     * @return TValue|null
     */
    public function pop() {}

    /**
     * @param  mixed  $key
     * @param  mixed  $default
     * @return TValue|null
     */
    public function pull($key, $default = null) {}

    /**
     * @param mixed $value
     * @param bool  $strict
     * @return TKey|false
     */
    public function search($value, $strict = false) {}

    /**
     * @return TValue|null
     */
    public function shift() {}

    /**
    * @return array<TKey, TValue>
    */
    public function all() {}

    /**
    * @param TKey $key
    * @param TValue $value
    * @return $this
    */
    public function put($key, $value) {}
}