title: Empty parameters in codeigniter url
body: <p>I have a controller which takes 4 parameters. Sometimes parameters can be empty. Standard url is like <strong>review/fetch_reviews/10/uk/topcomments/1234</strong>
  where 10 represents count for paging.If that parameter is blank then url becomes <strong>review/fetch_reviews//uk//</strong> and my sql query becomes <strong>select * from table limit uk,10</strong>.
  I even set default value for parameters as bellow</p>
  
  <pre><code>function fetch_reviews($page="10",$banktype="",$country="",$filter=""){
  </code></pre>
  
  <p>how to handle this? Itried URI routing but t doesnt work. </p>