PHP Question
How does php evaluate the expression $x+++$x++?
Please, take a look at the following expression:
$x = 20;
echo $x+++$x++; // 41
Why is the answer
4143
Answer
Altough I can't find any mention in the PHP docs, I guess PHP evaluates from right, and ++ acts like the same operator in C/C++ (see inc/dec PHP operator docs)
So, the expression:
$x+++$x++
in fact does (evaluated from the right):
- get the value of x → 20
- increment the value of x → 21
- get the value of x → 21
- increment the value of x → 22
- sum the values got from 1 and 3 → 41
It is worth mentioning, though, that in this case the same results is obtained even if the expression is evaluated from the left.
Source (Stackoverflow)