Is there a way to access all the variables in my script?

Is there some global array or something that contains all the variable names (not even values per se) that are used in my script. Here's the scenario. Like most of you, I do a lot of mySQL db work. So I tend to use this: if (mysql_num_rows($result) > 0) { $row = mysql_fetch_array($result,MYSQL_ASSOC); while(list($myVariableName,$sqlFieldName)=each($row)) { $$myVariableName = $sqlFieldName; } } So now I have a bunch of variables all named say, $company_name, $company_id, $company_phone, etc... What I want to do is make a function that can step through all the $company_ variables and unset them all. (I imagine I'll just string compare to "company_" and then prefix the result with $$, then set = "", etc. you get the idea) I suppose I could re-write all my code and use the $row['company_id'] method instead then clear $row[] but it would be nice to know if there is a way to do this 'my way' as well...