Can someone help me understand this? When I output the code in PHP it gives the answers a is 11 and b is 10, but I thought if I were to echo a it would equal 10, where as if I echo b it would be 10+1 ($a++).
See code
$a = 10;
$b = $a++;
echo $a;
echo $b;
Let me give you an idea using cases and interpretations:
Assuming:
let a = 10;
let b = 0;
Case 1: b = a++
Interprets to:
b = a; // b now is 10
a = a + 1; // a now is 11
Case 2: b = a--
Interprets to:
b = a; // b now is 10
a = a - 1; // a now is 9
Case 3: b = ++a
Interprets to:
a = a + 1; // a now is 11
b = a; // b now is 11
Case 4: b = --a
Interprets to:
a = a - 1; // a now is 9
b = a; // b now is 9
Note
Expression like a++ or --a changes the original variable. If you don't want to change the original variable, you need to write it like:
b = a + 1;
// Now b = 11 and a is still 10