Hopefully a very easy question for you. I have a PHP object, one of the properties has brackets in it (from using MIN mysql command):
stdClass Object ( [uid]
To directly answer your question, use curly braces around the property name as a string:
$row->{'min(time)'}
A better idea, though, is to give your aggregate value an alias in your SQL as mentioned by the other answers, then access the property by that alias. Defining an alias also gives you an opportunity to supply a more meaningful name than just a call to some aggregate function on a certain column or value.