pdo close connection

1$host     = "localhost";//Ip of database, in this case my host machine    
2$user     = "root";	//Username to use
3$pass     = "qwerty";//Password for that user
4$dbname   = "DB";//Name of the database
5
6try {
7    $connection = new PDO("mysql:host=$host;dbname=$dbname", $user, $pass);
8    $connection->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
9
10}catch(PDOException $e)
11{
12  echo $e->getMessage();                         
13}

1$pdo = null;

1$conn=new PDO("mysql:host=$host;dbname=$dbname",$user,$pass);
2    // If this is your connection then you have to assign null
3    // to your connection variable as follows:
4$conn=null;
5    // By this way you can close connection in PDO.
6