vendor/facebook/graph-sdk/src/Facebook/Http/RequestBodyMultipart.php

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<?php
/**
 * Copyright 2017 Facebook, Inc.
 *
 * You are hereby granted a non-exclusive, worldwide, royalty-free license to
 * use, copy, modify, and distribute this software in source code or binary
 * form for use in connection with the web services and APIs provided by
 * Facebook.
 *
 * As with any software that integrates with the Facebook platform, your use
 * of this software is subject to the Facebook Developer Principles and
 * Policies [http://developers.facebook.com/policy/]. This copyright notice
 * shall be included in all copies or substantial portions of the software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 */
namespace Facebook\Http;

use Facebook\FileUpload\FacebookFile;

/**
 * Class RequestBodyMultipartt
 *
 * Some things copied from Guzzle
 *
 * @package Facebook
 *
 * @see https://github.com/guzzle/guzzle/blob/master/src/Post/MultipartBody.php
 */
class RequestBodyMultipart implements RequestBodyInterface
{
    /**
     * @var string The boundary.
     */
    private $boundary;

    /**
     * @var array The parameters to send with this request.
     */
    private $params;

    /**
     * @var array The files to send with this request.
     */
    private $files = [];

    /**
     * @param array  $params   The parameters to send with this request.
     * @param array  $files    The files to send with this request.
     * @param string $boundary Provide a specific boundary.
     */
    public function __construct(array $params = [], array $files = [], $boundary = null)
    {