title: PHP: Case-insensitive parameters
body: <p>How do I accept passed <code>GET</code> or <code>POST</code> values case insensitively?</p>
  
  <p>Like <code>sample.php?OrderBy=asc</code> will still be the same as <code>sample.php?orderby=asc</code> or <code>sample.php?ORDERBY=asc</code></p>
  
  <p>Is there a means of achieving the above efficiently?</p>