Set variable in if statement expression

Question

I ran across some interesting code today. I tried to find out if this is a feature of PHP or if I am missing something, but was unable to find anything on Google. Probably becau

Answer 1

You can make an assignment like that in a conditional. What happened logically is that the value is assigned to $logo and then $logo is evaluated as to whether it is truthy. If it is truthy, the code in the conditional executes.

You will oftentimes see this sort of assignment/evaluation in the case of looping through database result sets, but generally I would suggest that it should be avoided outside such a common use case for sake of clarity in reading g code.

Answer 2

Yes, this is a feature. It's like:

$a=$b=5;

But in this case, imagine the bool result of if as var $a.

However, IDE's are used to complain about solutions like this because of == vs. = as a very common possible bug source.