title: How to get STRING query string value using php
body: <p>Suppose if I have string like this:</p>
  
  <pre><code>rajeshpatel&amp;rid=10&amp;sid=20&amp;mid=30
  </code></pre>
  
  <p>Then how can I get value of <code>"rid"</code> using php.</p>
  
  <p>any help?</p>