Sets and retrieves the database password used by the connection. If a database is protected by a database password, the user must call this function before calling fbsql_select_db().
If no link is open, the function will try to establish a link as if fbsql_connect() was called, and use it.
This function does not change the database password in the database nor can it be used to retrieve the database password for a database.
If optional and not specified, the function will try to find an open link to the FrontBase server and if no such link is found it will try to create one as if fbsql_connect() was called with no arguments
The database password, as a string. If given, the function sets the database password for the specified link identifier.
$link = fbsql_pconnect("localhost", "_SYSTEM", "secret")
or die("Could not connect");
fbsql_database_password($link, "secret db password");