是否有必要关闭PDO连接

Question

I noticed there is no close function for PDO. Should I close the connection or is it unnecessary for PDO?

Answer 1

Upon successful connection to the database, an instance of the PDO class is returned to your script. The connection remains active for the lifetime of that PDO object. To close the connection, you need to destroy the object by ensuring that all remaining references to it are deleted--you do this by assigning NULL to the variable that holds the object. If you don't do this explicitly, PHP will automatically close the connection when your script ends.

http://php.net/manual/en/pdo.connections.php

So the answer is no, you don't need to do anything unless you need to explicitly close the connection during the script execution for whatever reason, in which case just set your PDO object to null.