Do SQL connections opened with PDO in PHP have to be closed

Question

When I open a MySQL connection in PHP with just PHP\'s built-in MySQL functions, I do the following:

$link = mysql_connect($servername, $username, $password)         


        

Answer 1

http://uk3.php.net/pdo

From what i gather i could not see anyway to close it in the php manual, and examples of scripts i quickly looked at never closed the connection in anyway from what i could see.