// find out the current url / uri in *.rhtml file
// is quite simple with the request object

   1  
   2  <% page = request.request_uri %>
   3  page: <%= page %>

// but then different urls mean the same page
// (../admin = ../admin/ = ../admin/index = ..admin/index/)
// and maybe the id is unwanted too (../admin/show/8)
// so below is an alternative with control on which parameter is used

   1  
   2  <% page = "/" + request.path_parameters['controller'] + "/" + request.path_parameters['action'] %>
   3  page: <%= page %>

// description of your code here

   1  
   2  function http_test_existance($url) {
   3   return (($fp = @fopen($url, 'r')) === false) ? false : @fclose($fp);
   4  }

// in this example *.html is replaced by *.php
// its a redirect [R] and it is is permanent (code is 301)

   1  
   2  RewriteEngine On
   3  RewriteBase   /the_directory
   4  
   5  RewriteRule  ^(.*).html$ $1.php [R=301]

// if cms has cryptic urls
// in apache url-rewriting with .htaccess can help

   1  
   2  RewriteRule cms/fest$ cms/index.php?option=content&task=view&id=176&Itemid=202 [NC]

// [NC] = not case-sensitive