Thank you for your remind. We have corrected the error. Yes, you are right, these two solutions have the same logic.

What is Cute programming language?

It's a Cool variant designed specifically to encourage female students into Software Engineering and/or Computer Science.

Serious?

From the last paragraph, the author doesn't know the answer for the 5th question.

Actually, these tips for PHP coding cannnot guarantee improving efficiency in every project. For different apps,some of these tips may be very useful.For example, I was involved in one of the H.264 decoder development, some of the tiny operations would be run thousands times when decoding a video clip, even a small optimization improved the peformance largely.