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   1  <?php
   2  
   3  /**
   4   * @see       https://github.com/laminas/laminas-diactoros for the canonical source repository
   5   * @copyright https://github.com/laminas/laminas-diactoros/blob/master/COPYRIGHT.md
   6   * @license   https://github.com/laminas/laminas-diactoros/blob/master/LICENSE.md New BSD License
   7   */
   8  
   9  declare(strict_types=1);
  10  
  11  namespace Laminas\Diactoros;
  12  
  13  use function array_key_exists;
  14  use function is_string;
  15  use function strpos;
  16  use function strtolower;
  17  use function strtr;
  18  use function substr;
  19  
  20  /**
  21   * @param array $server Values obtained from the SAPI (generally `$_SERVER`).
  22   * @return array Header/value pairs
  23   */
  24  function marshalHeadersFromSapi(array $server) : array
  25  {
  26      $headers = [];
  27      foreach ($server as $key => $value) {
  28          if (! is_string($key)) {
  29              continue;
  30          }
  31  
  32          if ($value === '') {
  33              continue;
  34          }
  35  
  36          // Apache prefixes environment variables with REDIRECT_
  37          // if they are added by rewrite rules
  38          if (strpos($key, 'REDIRECT_') === 0) {
  39              $key = substr($key, 9);
  40  
  41              // We will not overwrite existing variables with the
  42              // prefixed versions, though
  43              if (array_key_exists($key, $server)) {
  44                  continue;
  45              }
  46          }
  47  
  48          if (strpos($key, 'HTTP_') === 0) {
  49              $name = strtr(strtolower(substr($key, 5)), '_', '-');
  50              $headers[$name] = $value;
  51              continue;
  52          }
  53  
  54          if (strpos($key, 'CONTENT_') === 0) {
  55              $name = strtr(strtolower($key), '_', '-');
  56              $headers[$name] = $value;
  57              continue;
  58          }
  59      }
  60  
  61      return $headers;
  62  }