title: Overriding parameters.yml values dynamically after running composer install in symfony
body: <p>This:</p>
  
  <pre><code>parameters_dev.yml.dist
     my_key: todays_timestamp_{$timestamp}
  </code></pre>
  
  <p>would generate:</p>
  
  <pre><code>parameters.yml
     my_key: todays_timestamp_9845712365
  </code></pre>
  
  <p>after running <code>composer install</code></p>
  
  <p>Is this possible yet or any workaround? What I'm trying to achieve is, everytime when I run <code>composer install</code>, <code>my_key</code> will have a unique value.</p>
  
  <hr>
  
  <p><strong>UPDATE</strong></p>
  
  <p>config.yml</p>
  
  <pre><code>doctrine_cache:
      providers:
          my_memcached_cache:
              namespace: %cache_namespace%
  </code></pre>
  
  <p>parameters.yml</p>
  
  <pre><code>parameters:
      cache_namespace: todays_timestamp_
  </code></pre>
  
  <p>Memcache stats will always be like this:</p>
  
  <pre><code>Server 127.0.0.1:11211
  stats cachedump 12 100
  
  Server 127.0.0.1:11211
  ITEM todays_timestamp_[My\Bundle\Acc][1] [1807 b; 1438597305 s]
  ITEM todays_timestamp_[My\Bundle\Mer][1] [1707 b; 1438597305 s]
  .....
  .....
  END
  </code></pre>
  
  <p>but I want <code>todays_timestamp_</code> to be changed all the time with attaching a unique suffix to it.</p>