Translations:Expression Manager/74/en

One of the LimeSurvey demo surveys uses a set of conditions that translates to this relevance equation:  {(age < 16) or (age == 20) or ... or (age == 80)}. In LimeSurvey 1.91+, (age < 16) is FALSE when there is no answer (the value is blank). However, in LimeSurey 1.92, (age < 16) is TRUE when there is no answer, since both PHP and JavaScript treat blank as 0 in mathematical comparisons. Thus, 1.91+ would hide that question when age was unanswered, but 1.92 would show it. We went to great pains to prevent this, but since we needed to have the Expressions generate identical results in PHP and JavaScript, there was no way to make 1.92 treat "" < 16 as FALSE. Fortunately, there is an easy work-around for this. If you want (age < 16) to be FALSE, then use this expression instead: {(!is_empty(age) and age < 16)}. You can use the new Survey Logic File view to quickly identify and fix any such comparisons in your survey.