Plugin not compatible on PHP <5.5

[claudiulodro]

The expression "empty($this->views[current_filter()])" is used numerous times in the plugin. This will cause fatal errors on PHP versions less than 5.5. A simple remedy would be to evaluate current_filter() before calling empty, store the result in a variable, then do "empty($this->views[$current_filter])".

[GaryJones]

Since WordPress core now requires PHP 5.6, it seems like this could be closed as wontfix.