title: Symfony2 Container merge/add parameters to the specific key
body: <p>I have a Container:</p>
  
  <pre><code>$newContainer = new ContainerBuilder();
  </code></pre>
  
  <p>I load some parameters:</p>
  
  <pre><code>$loader = new YamlFileLoader($newContainer, new FileLocator(__DIR__.'/../Resources/config/newFolder'));
  $loader-&gt;load('newParameters.yml');
  </code></pre>
  
  <p>And my container looks like this:  </p>
  
  <pre><code>  [parameters:protected] =&gt; Array
          (
              [exampleKey =&gt; Array
                  (
                      [parameter] =&gt; something value
                      [anotherParameter] =&gt; another value
                  )
  
          )
  </code></pre>
  
  <p>Now i do the merge:</p>
  
  <pre><code>$container-&gt;merge($newContainer);
  </code></pre>
  
  <p>And my merge looks like this - print_r($container):</p>
  
  <pre><code>  [parameters:protected] =&gt; Array
          (
              [existing] =&gt; Array
                  (
                  ...
                  )
              [existing2] =&gt; Array
                  (
                  ...
                  )          
              [exampleKey =&gt; Array
                  (
                      [parameter] =&gt; something value
                      [anotherParameter] =&gt; another value
                  )
              [existing3] =&gt; Array
                  (
                  ...
                  )    
          ) 
  </code></pre>
  
  <p><strong>How can merge my container so i have this??:</strong></p>
  
  <pre><code>  [parameters:protected] =&gt; Array
          (
              [existing] =&gt; Array
                  (
                  ...
                  )
              [existing2] =&gt; Array
                  (
                  ...
                  [exampleKey =&gt; Array
                      (
                          [parameter] =&gt; something value
                          [anotherParameter] =&gt; another value
                      )                    
                  )          
              [existing3] =&gt; Array
                  (
                  ...
                  )    
          )  
  </code></pre>
  
  <p>Please help...</p>