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   1  <?php
   2  
   3  /*
   4   * This file is part of the Symfony package.
   5   *
   6   * (c) Fabien Potencier <fabien@symfony.com>
   7   *
   8   * For the full copyright and license information, please view the LICENSE
   9   * file that was distributed with this source code.
  10   */
  11  
  12  namespace Symfony\Component\HttpKernel\Config;
  13  
  14  use Symfony\Component\Config\Resource\SelfCheckingResourceInterface;
  15  
  16  /**
  17   * EnvParametersResource represents resources stored in prefixed environment variables.
  18   *
  19   * @author Chris Wilkinson <chriswilkinson84@gmail.com>
  20   */
  21  class EnvParametersResource implements SelfCheckingResourceInterface, \Serializable
  22  {
  23      /**
  24       * @var string
  25       */
  26      private $prefix;
  27  
  28      /**
  29       * @var string
  30       */
  31      private $variables;
  32  
  33      /**
  34       * @param string $prefix
  35       */
  36      public function __construct($prefix)
  37      {
  38          $this->prefix = $prefix;
  39          $this->variables = $this->findVariables();
  40      }
  41  
  42      /**
  43       * {@inheritdoc}
  44       */
  45      public function __toString()
  46      {
  47          return serialize($this->getResource());
  48      }
  49  
  50      /**
  51       * {@inheritdoc}
  52       */
  53      public function getResource()
  54      {
  55          return array('prefix' => $this->prefix, 'variables' => $this->variables);
  56      }
  57  
  58      /**
  59       * {@inheritdoc}
  60       */
  61      public function isFresh($timestamp)
  62      {
  63          return $this->findVariables() === $this->variables;
  64      }
  65  
  66      public function serialize()
  67      {
  68          return serialize(array('prefix' => $this->prefix, 'variables' => $this->variables));
  69      }
  70  
  71      public function unserialize($serialized)
  72      {
  73          $unserialized = unserialize($serialized);
  74  
  75          $this->prefix = $unserialized['prefix'];
  76          $this->variables = $unserialized['variables'];
  77      }
  78  
  79      private function findVariables()
  80      {
  81          $variables = array();
  82  
  83          foreach ($_SERVER as $key => $value) {
  84              if (0 === strpos($key, $this->prefix)) {
  85                  $variables[$key] = $value;
  86              }
  87          }
  88  
  89          ksort($variables);
  90  
  91          return $variables;
  92      }
  93  }