Idea of optimizing php !empty(...) expression.

I use !empty() very often and decided to make a benchmark test. Here is the code and results: http://pastebin.com/fMhhdQiW if (!empty(...)) working on 23% slower than if (empty()) expression. So if create new operator not_empty() it will improve performance. The first question is: What do you think about optimizing !empty(...), do we need it ? And I see two way to make this happen. 1. Create new language entity "not_empty". 2. Improve parser and help to handle "!empty" calls different way. It is obviously that option 2 is better. Is it real to optimize parser that way? Thanks! -- Best Regards, Oleg