Description:
------------
In documentation write 
"This function will return FALSE and generate an error if handle is not a 
resource."
But in test script get_resource_type return "Unknown" instead FALSE.

Test script:
---------------
mysql_free_result($res);
var_dump(is_resource($res));
var_dump(get_resource_type($res));



Expected result:
----------------
bool(true)
string(7) "Unknown"

or 

bool(false)
bool(false)

Actual result:
--------------
bool(false)
string(7) "Unknown"