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
Return Values
Returns a result pointer which can be used with the
fbsql_field_xxx functions, or FALSE on error.
Errors/Exceptions
A string describing the error will be placed in
$phperrmsg, and unless the function was called as
@fbsql() then this error string will also be printed
out.