Is it necessary to close PDO connections

Question

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

Answer 1

From the PDO's connection page

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.

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EDIT

I'd rather use persistent connection. Though, it's a good practice to close all connections at the end of the script.