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$a++ + ++$a
                                  $a  Stack
...
3. Increment $a                   12  10
4. Push $a on stack               12  10,$a
5. Add                            12  22

++$a + $a++
                                  $a  Stack
...
3. Push copy of $a on stack       11  $a,11
4. Increment $a                   12  $a,11
5. Add                            12  23