title: php reload page with updated query string
body: <p>let say I have an url like this</p>
  
  <pre><code>http://www.domain.com/myscript.php?p1=xyz&amp;p2=10&amp;p3=ghj
  </code></pre>
  
  <p>Now i want to update <code>p2=100</code> and reload the page using php</p>
  
  <p>here parameters can be unlimited <code>(p1,p2,...pn)</code>, and we can update any param and reload the page.</p>