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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\ResourceInterface;
  15  
  16  /**
  17   * EnvParametersResource represents resources stored in prefixed environment variables.
  18   *
  19   * @author Chris Wilkinson <chriswilkinson84@gmail.com>
  20   */
  21  class EnvParametersResource implements ResourceInterface, \Serializable
  22  {
  23      /**
  24       * @var string
  25       */
  26      private $prefix;
  27  
  28      /**
  29       * @var string
  30       */
  31      private $variables;
  32  
  33      /**
  34       * Constructor.
  35       *
  36       * @param string $prefix
  37       */
  38      public function __construct($prefix)
  39      {
  40          $this->prefix = $prefix;
  41          $this->variables = $this->findVariables();
  42      }
  43  
  44      /**
  45       * {@inheritdoc}
  46       */
  47      public function __toString()
  48      {
  49          return serialize($this->getResource());
  50      }
  51  
  52      /**
  53       * {@inheritdoc}
  54       */
  55      public function getResource()
  56      {
  57          return array('prefix' => $this->prefix, 'variables' => $this->variables);
  58      }
  59  
  60      /**
  61       * {@inheritdoc}
  62       */
  63      public function isFresh($timestamp)
  64      {
  65          return $this->findVariables() === $this->variables;
  66      }
  67  
  68      public function serialize()
  69      {
  70          return serialize(array('prefix' => $this->prefix, 'variables' => $this->variables));
  71      }
  72  
  73      public function unserialize($serialized)
  74      {
  75          $unserialized = unserialize($serialized);
  76  
  77          $this->prefix = $unserialized['prefix'];
  78          $this->variables = $unserialized['variables'];
  79      }
  80  
  81      private function findVariables()
  82      {
  83          $variables = array();
  84  
  85          foreach ($_SERVER as $key => $value) {
  86              if (0 === strpos($key, $this->prefix)) {
  87                  $variables[$key] = $value;
  88              }
  89          }
  90  
  91          ksort($variables);
  92  
  93          return $variables;
  94      }
  95  }