vendor/guzzle/guzzle/src/Guzzle/Plugin/History/HistoryPlugin.php

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<?php

namespace Guzzle\Plugin\History;

use Guzzle\Common\Event;
use Guzzle\Http\Message\RequestInterface;
use Guzzle\Http\Message\Response;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;

/**
 * Maintains a list of requests and responses sent using a request or client
 */
class HistoryPlugin implements EventSubscriberInterface, \IteratorAggregate, \Countable
{
    /** @var int The maximum number of requests to maintain in the history */
    protected $limit = 10;

    /** @var array Requests and responses that have passed through the plugin */
    protected $transactions = array();

    public static function getSubscribedEvents()
    {
        return array('request.sent' => array('onRequestSent', 9999));
    }

    /**
     * Convert to a string that contains all request and response headers
     *
     * @return string
     */
    public function __toString()
    {
        $lines = array();
        foreach ($this->transactions as $entry) {
            $response = isset($entry['response']) ? $entry['response'] : '';
            $lines[] = '> ' . trim($entry['request']) . "\n\n< " . trim($response) . "\n";
        }

        return implode("\n", $lines);
    }

    /**
     * Add a request to the history
     *
     * @param RequestInterface $request  Request to add
     * @param Response         $response Response of the request
     *
     * @return HistoryPlugin
     */
    public function add(RequestInterface $request, Response $response = null)
    {
        if (!$response && $request->getResponse()) {
            $response = $request->getResponse();
        }

        $this->transactions[] = array('request' => $request, 'response' => $response);
        if (count($this->transactions) > $this->getlimit()) {
            array_shift($this->transactions);
        }