vendor/zendframework/zend-diactoros/src/Response/SapiEmitterTrait.php

   1 <?php
   2 /**
   3  * @see       https://github.com/zendframework/zend-diactoros for the canonical source repository
   4  * @copyright Copyright (c) 2015-2018 Zend Technologies USA Inc. (http://www.zend.com)
   5  * @license   https://github.com/zendframework/zend-diactoros/blob/master/LICENSE.md New BSD License
   6  */
   7
   8 namespace Zend\Diactoros\Response;
   9
  10 use Psr\Http\Message\ResponseInterface;
  11 use RuntimeException;
  12
  13 use function ob_get_length;
  14 use function ob_get_level;
  15 use function sprintf;
  16 use function str_replace;
  17 use function ucwords;
  18
  19 /**
  20  * @deprecated since 1.8.0. The package zendframework/zend-httphandlerrunner
  21  *     now provides this functionality.
  22  */
  23 trait SapiEmitterTrait
  24 {
  25     /**
  26      * Checks to see if content has previously been sent.
  27      *
  28      * If either headers have been sent or the output buffer contains content,
  29      * raises an exception.
  30      *
  31      * @throws RuntimeException if headers have already been sent.
  32      * @throws RuntimeException if output is present in the output buffer.
  33      */
  34     private function assertNoPreviousOutput()
  35     {
  36         if (headers_sent()) {
  37             throw new RuntimeException('Unable to emit response; headers already sent');
  38         }
  39
  40         if (ob_get_level() > 0 && ob_get_length() > 0) {
  41             throw new RuntimeException('Output has been emitted previously; cannot emit response');
  42         }
  43     }
  44
  45     /**
  46      * Emit the status line.
  47      *
  48      * Emits the status line using the protocol version and status code from
  49      * the response; if a reason phrase is available, it, too, is emitted.
  50      *
  51      * It is important to mention that this method should be called after
  52      * `emitHeaders()` in order to prevent PHP from changing the status code of
  53      * the emitted response.
  54      *
  55      * @param ResponseInterface $response
  56      *
  57      * @see \Zend\Diactoros\Response\SapiEmitterTrait::emitHeaders()
  58      */
  59     private function emitStatusLine(ResponseInterface $response)
  60     {
  61         $reasonPhrase = $response->getReasonPhrase();
  62         $statusCode   = $response->getStatusCode();
  63
  64         header(sprintf(
  65             'HTTP/%s %d%s',
  66             $response->getProtocolVersion(),
  67             $statusCode,
  68             ($reasonPhrase ? ' ' . $reasonPhrase : '')
  69         ), true, $statusCode);
  70     }
  71
  72     /**
  73      * Emit response headers.
  74      *
  75      * Loops through each header, emitting each; if the header value
  76      * is an array with multiple values, ensures that each is sent
  77      * in such a way as to create aggregate headers (instead of replace
  78      * the previous).
  79      *
  80      * @param ResponseInterface $response
  81      */
  82     private function emitHeaders(ResponseInterface $response)
  83     {
  84         $statusCode = $response->getStatusCode();
  85
  86         foreach ($response->getHeaders() as $header => $values) {
  87             $name  = $this->filterHeader($header);
  88             $first = $name === 'Set-Cookie' ? false : true;
  89             foreach ($values as $value) {
  90                 header(sprintf(
  91                     '%s: %s',
  92                     $name,
  93                     $value
  94                 ), $first, $statusCode);
  95                 $first = false;
  96             }
  97         }
  98     }
  99
 100     /**
 101      * Filter a header name to wordcase
 102      *
 103      * @param string $header
 104      * @return string
 105      */
 106     private function filterHeader($header)
 107     {
 108         $filtered = str_replace('-', ' ', $header);
 109         $filtered = ucwords($filtered);
 110         return str_replace(' ', '-', $filtered);
 111     }
 112 }