isset empty or ...?

[John Taylor-Johnston <john.taylor-johnston@xxxxxxxxxxxxxxxxxxxxx>]

I'm using

if($mydata->DPRresponselocationaddress1 != "")

is this the same as

if (!isset($mydata->DPRresponselocationaddress))
http://php.net/manual/en/function.isset.php

or

if (!empty($mydata->DPRresponselocationaddress))
http://php.net/manual/en/function.empty.php

or is there another function I have not learned yet? I don't really get 
the difference between isset and empty.

John

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