HELP! Why does this equal 2 and not 3????

Question

<?php
$a = 2;
$b = $a++;
echo "$b";
?>

Answer 1

because $b = $a++; mean use the value of a to b first then increase the value of a by 1 ,the b will become 3 if you use ++$a instead of $a++.

Answer 2

I see! so
$b = $a++; = 2
and
$b = ++$a; = 3

THANKYOU!!

Answer 3

$a++ is post incrementation which means the value of a is used first then incremented later so when $b=$a++ $b equals two,but in the next line a is incremented