title: sql add number to sum the value from database
body: <p>Right now the value from the table is 1 and I want to add 5 so the final result would be 6.</p>
  
  <p>The update always gets 5 so how can i just add 5 to the current number from the table?</p>
  
  <pre><code>$amount = 5
  
  $sql = "UPDATE `table_projects` SET `package1`= $amount WHERE `id`='$userid'";
  </code></pre>