title: mysqli insert data is blank and adding double
body: <p>I am trying to learn mysqli so I convert my site over. And I was having a hard time on the update part so I decided to take baby steps and go a little at a time. </p>
  
  <p>Well I am trying to switch over the add-item page which uses the INSERT. The issue is, there is nothing being put into the database and it putting 2 blank rows in. (Like 2 items are being added)</p>
  
  <p>I have been wearing this board out with questions and I search for the answers and do trial &amp; error before asking, but I just cannot seem to grasp this mysqli. It works great with mysql, but with it being depreciated, I wanted to switch it over.</p>
  
  <p>post2.php </p>
  
  <pre><code>     &lt;?php
  
          $db = new mysqli("localhost","admin","pass","database"); 
  
          if(!$db) {
      die('sorry we are having some problbems');
  }
  
  if(isset($_POST['submit'])) {
      $stmt = $db-&gt;prepare("INSERT INTO new_equip(`id`,`itemname`, `manufacture`, `model`,`serial`) VALUES(?,?,?,?,?)");
      $stmt-&gt;bind_param("issss", $_POST['id'], $_POST['itemname'], $_POST['manufacture'], $_POST['model'], $_POST['serial']);
  
      if(!$stmt-&gt;execute()) {
      // Do your error stuff
  
    die('Error: ' . mysqli_error($db));
   }
  
  }
  echo $sql;
  var_dump($_POST);
  mysqli_close($db);
  ?&gt;
  </code></pre>
  
  <p>add-item.php </p>
  
  <pre><code>&lt;form method="post" action="post2.php" enctype="multipart/form-data" class="form-horizontal" accept-charset="UTF-8"&gt;
  &lt;div class="form-group"&gt;
      &lt;label class="col-md-3"&gt;Item Name&lt;/label&gt;
      &lt;input type="text" name="itemname" value="" class="form-control" /&gt;
  &lt;/div&gt; &lt;!-- /.form-group --&gt;
  &lt;div class="form-group"&gt;
      &lt;label class="col-md-3"&gt;Manufacture&lt;/label&gt;
      &lt;input type="text" name="manufacture" value="" class="form-control" /&gt;
  &lt;/div&gt; &lt;!-- /.form-group --&gt;
  &lt;div class="form-group"&gt;
      &lt;label class="col-md-3"&gt;Model&lt;/label&gt;
      &lt;input type="text" name="model" value="" class="form-control" /&gt;
  &lt;/div&gt; &lt;!-- /.form-group --&gt;
  &lt;div class="form-group"&gt;
      &lt;label class="col-md-3"&gt;Serial&lt;/label&gt;
      &lt;input type="text" name="serial" value="" class="form-control" /&gt;
  &lt;/div&gt; &lt;!-- /.form-group --&gt;
  &lt;div class="col-md-8 col-md-push-3"&gt;
      &lt;input type="submit" name="Submit" class="btn btn-primary"&gt;
      &amp;nbsp;
      &lt;button type="reset" class="btn btn-default"&gt;Cancel&lt;/button&gt;
  &lt;/div&gt; &lt;!-- /.col --&gt;
  </code></pre>