Description:
------------
mysql_info() returns false when inserting only one row. This results in the unability to retreive the number of warnings which might have occurred.

if $numWarnings > 0 I would like to retreive the warnings with mysql_query("SHOW WARNINGS"); but I'd prefer not doing that if there are no warnings.

Reproduce code:
---------------
mysql_query("CREATE TABLE a (a VARCHAR(4))");
mysql_query("INSERT INTO a (a) VALUES ('abcde')");
var_dump(mysql_info());

Expected result:
----------------
Just like the mysql-CLI:

mysql> INSERT INTO a (a) VALUES ('abcde');
Query OK, 1 row affected, 1 warning (0.01 sec)

so something like "1 row affected, 1 warning" would be perfect

Actual result:
--------------
bool(false)