PHP. Руководство по PHP. 2005
pg_close
pg_close
Описание
bool pg_close ([resource connection])pg_close() closes the non-persistent
connection to a PostgreSQL database associated with the given
connection resource.
Замечание:
Using pg_close() is not usually necessary, as
non-persistent open connections are automatically closed at the end
of the script.
If there is open large object resource on the connection, do not
close the connection before closing all large object resources.