<?php
/**
* CakePHP(tm) : Rapid Development Framework (https://cakephp.org)
* Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
*
* Licensed under The MIT License
* For full copyright and license information, please see the LICENSE.txt
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
* @link https://cakephp.org CakePHP(tm) Project
* @since 3.3.4
* @license https://opensource.org/licenses/mit-license.php MIT License
*/
namespace Cake\Http;
use Zend\Diactoros\CallbackStream as BaseCallbackStream;
/**
* Implementation of PSR HTTP streams.
*
* This differs from Zend\Diactoros\Callback stream in that
* it allows the use of `echo` inside the callback, and gracefully
* handles the callback not returning a string.
*
* Ideally we can amend/update diactoros, but we need to figure
* that out with the diactoros project. Until then we'll use this shim
* to provide backwards compatibility with existing CakePHP apps.
*
* @internal
*/
class CallbackStream extends BaseCallbackStream
{
/**
* {@inheritdoc}
*
* @return string
*/
public function getContents()
{
$callback = $this->detach();
$result = '';
if (is_callable($callback)) {
$result = $callback();
}
if (!is_string($result)) {
return '';
}
return $result;
}
}