In this link
"When a persistent connection is requested, PHP checks if there's already an identical persistent connection from earlier remained open. If it exists, it uses it. What meaning of remained open? Persistent connection are links that do not close when the execution of your script ends."
At the end of my every php file I disconnect with making the connection null like this:
$dbpdo = null;
1. So I think I will never have a persistent connection open? Is that right?
2. If so, how will use the idea of improving performance as described at the link?