TRUE on success,
FALSE on error.
fbsql_close() closes the connection to the FrontBase server that's associated with the specified link identifier. If link_identifier isn't specified, the last opened link is used.
Using fbsql_close() isn't usually necessary, as non-persistent open links are automatically closed at the end of the script's execution.
$link = fbsql_connect("localhost", "_SYSTEM", "secret")
or die("Could not connect");
echo "Connected successfully";