Of which conditions do we speak?
If you have multiple values in one field in the db, use the IN statement, like: "where '$is_survey' IN .."
If you don't have to do a query for the condition, use delimiters like a comma to separate the values in the field, then
$conditions = explode(",", $data_from_field);
The conditions will then be available as $condition[0], $condition[1] and so on, and may be compared in if-else.
knutm