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<?php
/**
* @see https://github.com/zendframework/zend-diactoros for the canonical source repository
* @copyright Copyright (c) 2015-2017 Zend Technologies USA Inc. (http://www.zend.com)
* @license https://github.com/zendframework/zend-diactoros/blob/master/LICENSE.md New BSD License
*/
namespace Zend\Diactoros\Response;
use Psr\Http\Message\ResponseInterface;
use RuntimeException;
trait SapiEmitterTrait
{
/**
* Checks to see if content has previously been sent.
*
* If either headers have been sent or the output buffer contains content,
* raises an exception.
*
* @throws RuntimeException if headers have already been sent.
* @throws RuntimeException if output is present in the output buffer.
*/
private function assertNoPreviousOutput()
{
if (headers_sent()) {
throw new RuntimeException('Unable to emit response; headers already sent');
}
if (ob_get_level() > 0 && ob_get_length() > 0) {
throw new RuntimeException('Output has been emitted previously; cannot emit response');
}
}
/**
* Emit the status line.
*
* Emits the status line using the protocol version and status code from
* the response; if a reason phrase is available, it, too, is emitted.
*
* It is important to mention that this method should be called after
* `emitHeaders()` in order to prevent PHP from changing the status code of
* the emitted response.
*
* @param ResponseInterface $response
*
* @see \Zend\Diactoros\Response\SapiEmitterTrait::emitHeaders()
*/
private function emitStatusLine(ResponseInterface $response)
{
$reasonPhrase = $response->getReasonPhrase();
$statusCode = $response->getStatusCode();
header(sprintf(
'HTTP/%s %d%s',
$response->getProtocolVersion(),
$statusCode,
($reasonPhrase ? ' ' . $reasonPhrase : '')
), true, $statusCode);
}
/**
* Emit response headers.
*
* Loops through each header, emitting each; if the header value
* is an array with multiple values, ensures that each is sent
* in such a way as to create aggregate headers (instead of replace
* the previous).
*
* @param ResponseInterface $response
*/
private function emitHeaders(ResponseInterface $response)
{
$statusCode = $response->getStatusCode();
foreach ($response->getHeaders() as $header => $values) {
$name = $this->filterHeader($header);
$first = $name === 'Set-Cookie' ? false : true;
foreach ($values as $value) {
header(sprintf(
'%s: %s',
$name,
$value
), $first, $statusCode);
$first = false;
}
}
}
/**
* Filter a header name to wordcase
*
* @param string $header
* @return string
*/
private function filterHeader($header)
{
$filtered = str_replace('-', ' ', $header);
$filtered = ucwords($filtered);
return str_replace(' ', '-', $filtered);
}
}