(PHP 4, PHP 5)
pg_close — Closes a PostgreSQL connection
$connection
  ] )
   pg_close() closes the non-persistent
   connection to a PostgreSQL database associated with the given
   connection resource.
  
Note:
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.
connection
       PostgreSQL database connection resource.  When 
       connection is not present, the default connection 
       is used. The default connection is the last connection made by 
       pg_connect() or pg_pconnect().
      
   Returns TRUE on success or FALSE on failure.
  
Example #1 pg_close() example
<?php
$dbconn = pg_connect("host=localhost port=5432 dbname=mary")
   or die("Could not connect");
echo "Connected successfully";
pg_close($dbconn);
?>
The above example will output:
Connected successfully