title: Lost select value after submitting and clicking on link
body: <p>Hello I have problem that I'm loosing <code>$_POST['id']</code> value from select tag after clicking on href. Well the code is here: </p>
  
  <pre><code>$page = 1;
  if (isset($_POST['id'])){
      $id = $_POST['id'];
  }
  
  echo $id[0];
  ?&gt;
  
  &lt;ul&gt;
      &lt;li&gt;&lt;a href="?show=all"&gt;Show All&lt;/a&gt;&lt;/li&gt;
      &lt;li&gt;&lt;a href="?show=submitted"&gt;Show Submitted&lt;/a&gt;&lt;/li&gt;
      &lt;li&gt;&lt;a href="?show=pending"&gt;Show Pending&lt;/a&gt;&lt;/li&gt;
      &lt;li&gt;&lt;a href="?show=not"&gt;Show Not Submitted&lt;/a&gt;&lt;/li&gt;
  &lt;/ul&gt;
  
  &lt;form action="" method="post"&gt;
      &lt;select name="id"&gt;
          &lt;option value="1"&gt;one&lt;/option&gt;
          &lt;option value="2"&gt;two&lt;/option&gt;
          &lt;option value="3"&gt;three&lt;/option&gt;
          &lt;option value="4"&gt;four&lt;/option&gt;
          &lt;option value="5"&gt;five&lt;/option&gt;
          &lt;option value="6"&gt;six&lt;/option&gt;
          &lt;option value="7"&gt;seven&lt;/option&gt;
          &lt;option value="8"&gt;eight&lt;/option&gt;
      &lt;/select&gt;
      &lt;input type="submit" name="mode" value="Select" /&gt;
  &lt;/form&gt;
  </code></pre>
  
  <p>The idea is that after when i've selected some value from selected field I need to keep that value in variable and also I need for further filtering SQL query which works after <code>&lt;a href=""&gt;</code>.
  At the moment after submitting form I get select value, but after further filtering pressing any of <code>&lt;a href=""&gt;</code> links <code>$_POST</code> value dissapears... how can I keep that value after pressing on any link?</p>