vendor/guzzlehttp/guzzle/src/Handler/CurlMultiHandler.php

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<?php

namespace GuzzleHttp\Handler;

use GuzzleHttp\Promise as P;
use GuzzleHttp\Promise\Promise;
use GuzzleHttp\Promise\PromiseInterface;
use GuzzleHttp\Utils;
use Psr\Http\Message\RequestInterface;

/**
 * Returns an asynchronous response using curl_multi_* functions.
 *
 * When using the CurlMultiHandler, custom curl options can be specified as an
 * associative array of curl option constants mapping to values in the
 * **curl** key of the provided request options.
 *
 * @property resource|\CurlMultiHandle $_mh Internal use only. Lazy loaded multi-handle.
 *
 * @final
 */
#[\AllowDynamicProperties]
class CurlMultiHandler
{
    /**
     * @var CurlFactoryInterface
     */
    private $factory;

    /**
     * @var int
     */
    private $selectTimeout;

    /**
     * @var int Will be higher than 0 when `curl_multi_exec` is still running.
     */
    private $active = 0;

    /**
     * @var array Request entry handles, indexed by handle id in `addRequest`.
     *
     * @see CurlMultiHandler::addRequest
     */
    private $handles = [];

    /**
     * @var array<int, float> An array of delay times, indexed by handle id in `addRequest`.
     *
     * @see CurlMultiHandler::addRequest
     */
    private $delays = [];

    /**
     * @var array<mixed> An associative array of CURLMOPT_* options and corresponding values for curl_multi_setopt()
     */
    private $options = [];

    /**
     * This handler accepts the following options: