All the mysql_* functions will assume "the last connection you opened" if you don't specify a connection. This is useful because you don't have to keep track of it like you do for other libraries. Most likely here you are overwriting the variable $dbh somewhere. Personally I'd use a variable like $_connection if I use one at all.
So just mysql_close() will be enough to close the connection. You need only worry about this kind of thing if you are handling more than one connection at a time.
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