<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\HttpFoundation;

/**
 * StreamedResponse represents a streamed HTTP response.
 *
 * A StreamedResponse uses a callback for its content.
 *
 * The callback should use the standard PHP functions like echo
 * to stream the response back to the client. The flush() function
 * can also be used if needed.
 *
 * @see flush()
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
class StreamedResponse extends Response
{
    protected $callback;
    protected $streamed;
    private bool $headersSent;

    public function __construct(callable $callback = null, int $status = 200, array $headers = [])
    {
        parent::__construct(null, $status, $headers);

        if (null !== $callback) {
            $this->setCallback($callback);
        }
        $this->streamed = false;
        $this->headersSent = false;
    }

    /**
     * Sets the PHP callback associated with this Response.
     *
     * @return $this
     */
    public function setCallback(callable $callback): static
    {
        $this->callback = $callback;

        return $this;
    }

    /**
     * {@inheritdoc}
     *
     * This method only sends the headers once.
     *
     * @return $this
     */
    public function sendHeaders(): static
    {
        if ($this->headersSent) {
            return $this;
        }

        $this->headersSent = true;

        return parent::sendHeaders();
    }

    /**
     * {@inheritdoc}
     *
     * This method only sends the content once.
     *
     * @return $this
     */
    public function sendContent(): static
    {
        if ($this->streamed) {
            return $this;
        }

        $this->streamed = true;

        if (null === $this->callback) {
            throw new \LogicException('The Response callback must not be null.');
        }

        ($this->callback)();

        return $this;
    }

    /**
     * {@inheritdoc}
     *
     * @throws \LogicException when the content is not null
     *
     * @return $this
     */
    public function setContent(?string $content): static
    {
        if (null !== $content) {
            throw new \LogicException('The content cannot be set on a StreamedResponse instance.');
        }

        $this->streamed = true;

        return $this;
    }

    /**
     * {@inheritdoc}
     */
    public function getContent(): string|false
    {
        return false;
    }
}

• [D] Exception
• [D] File
• [D] RateLimiter
• [D] Session
• [D] Test
• [F] AcceptHeader.php
  Delete
• [F] AcceptHeaderItem.php
  Delete
• [F] BinaryFileResponse.php
  Delete
• [F] CHANGELOG.md
  Delete
• [F] composer.json
  Delete
• [F] Cookie.php
  Delete
• [F] ExpressionRequestMatcher.php
  Delete
• [F] FileBag.php
  Delete
• [F] HeaderBag.php
  Delete
• [F] HeaderUtils.php
  Delete
• [F] InputBag.php
  Delete
• [F] IpUtils.php
  Delete
• [F] JsonResponse.php
  Delete
• [F] LICENSE
  Delete
• [F] ParameterBag.php
  Delete
• [F] README.md
  Delete
• [F] RedirectResponse.php
  Delete
• [F] Request.php
  Delete
• [F] RequestMatcher.php
  Delete
• [F] RequestMatcherInterface.php
  Delete
• [F] RequestStack.php
  Delete
• [F] Response.php
  Delete
• [F] ResponseHeaderBag.php
  Delete
• [F] ServerBag.php
  Delete
• [F] StreamedResponse.php
  Delete
• [F] UrlHelper.php
  Delete

Blog Section

Discover the Latest in Digital Payments and NFC Technology

Dive into our blog to explore the cutting-edge trends in digital payments and NFC technology. Stay updated on the innovations that are revolutionizing transactions, boosting security, and making payments quicker and more convenient. Learn how these advancements are shaping the future of financial interactions and driving the global transition towards a cashless world.

The Rise of Contactless Payments:...

In recent years, contactless payments have surged in popularity, driven...

Visit Blog

March 27, 2024

Enhancing Payment Security: The Role...

As digital transactions proliferate, ensuring robust payment security is more critical than ever. Two foundational...

Visit Blog

March 27, 2024

The Future of Digital Wallets:...

Digital wallets have fundamentally transformed how we manage money, offering a streamlined, secure, and highly...

Visit Blog

March 27, 2024