title: how to build hyperlink for query string in php
body: <p>I have a question, How I can add another get variable in my current url</p>
  
  <pre><code> book.php?action=addressbook
  </code></pre>
  
  <p>i want to add </p>
  
  <pre><code> book.php?action=addressbook&amp;page=2
  </code></pre>
  
  <p>how to generate hyperlink for this, i have tried it using $_SERVER['PHP_SELF'] but query string are not included in url its showing something like that</p>
  
  <pre><code>book.php?page=2
  </code></pre>
  
  <p>I want to append my other variables to query string</p>
  
  <p>Please help </p>