title: get value by id link with the href
body: <p>this is my input</p>
  <pre><code>&lt;input type=&quot;text&quot; name=&quot;quantity&quot; id=&quot;quantity&quot; value=&quot;1&quot; /&gt;
  </code></pre>
  <p>this is my href link</p>
  <pre><code>&lt;a href=&quot;UserOrderProduct.php?id=&lt;?php echo $Pid; ?&gt;
  &amp;price=&lt;?php echo $Price; ?&gt;&amp;quantity=&quot;&gt;add&lt;/a&gt;
  </code></pre>
  <p>how to write it in the href and please ignore the</p>
  <pre><code>&lt;?php echo $Pid; ?&gt;&amp;price=&lt;?php echo $Price; ?&gt;
  </code></pre>
  <p>this is because i get the id already from the database but only the quantity not really how to get it, can teach me?</p>