title: How to get a Magento product collection as a comma separated list of SKU's
body: <p>I have a custom module I made for Magento. From the admin, there is a multi-select list of store products. The selected products from this are output in the form of a comma separated list of SKU's - for example:</p>
  
  <pre><code>// Get Featured Products from list
      $configData = Mage::getStoreConfig('featured_products');
      $featuredlist = $configData['settings']['featuredlist'];
  </code></pre>
  
  <p>This gives the output in the following format if I &lt; ?php echo $featuredlist ?>:</p>
  
  <pre><code>cn,asc,ken,steve,nine,ecco,ana
  </code></pre>
  
  <p>Is it possible to output a collection from a category in the same way, as a comma separated list of SKU's? I currently use the following to get a collection:</p>
  
  <pre><code>$_productCollection = Mage::getResourceModel('reports/product_collection')
      -&gt;addAttributeToSelect('*')
      -&gt;addAttributeToFilter('visibility', $visibility)
      -&gt;addCategoryFilter($_category);
      $_productCollection-&gt;load()
  </code></pre>