title: How do you change the page name for Paginator?
body: <p>Current <code>Paginator</code> is using <code>?page=N</code>, but I want to use something else. How can I change so it's <code>?sida=N</code> instead?</p>
  
  <p>I've looked at <code>Illuminate\Pagination\Environment</code> and there is a method (<code>setPageName()</code>) there to change it (I assume), but how do you use it?</p>
  
  <p>In the <code>Paginator</code> class there is a method the change the base url (<code>setBaseUrl()</code>) in the <code>Environment</code> class, but there is no method for setting a page name. Do I really need to extend the <code>Paginator</code> class just to be able to change the page name?</p>