Should one use `if ($a!= NULL)` or `if ($a!== NULL)` to control program flow?

I haven't done any performance tests on loose vs strict comparison operators, but for what you are trying to do, I would instead recommend something like.

You could write a test code like this before asking; according to test "Using "===" is 30x quicker than is_null().

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.