Pretty printer generates least-parentheses output ----- 0) > (1 < 0); ++$a + $b; $a + $b++; $a ** $b ** $c; ($a ** $b) ** $c; -1 ** 2; yield from $a and yield from $b; yield from ($a and yield from $b); // The following will currently add unnecessary parentheses, because the pretty printer is not aware that assignment // and incdec only work on variables. !$a = $b; ++$a ** $b; $a ** $b++; ----- echo 'abc' . 'cde' . 'fgh'; echo 'abc' . ('cde' . 'fgh'); echo 'abc' . 1 + 2 . 'fgh'; echo 'abc' . (1 + 2) . 'fgh'; echo 1 * 2 + 3 / 4 % 5 . 6; echo 1 * (2 + 3) / (4 % (5 . 6)); $a = $b = $c = $d = $f && true; ($a = $b = $c = $d = $f) && true; $a = $b = $c = $d = $f and true; $a = $b = $c = $d = ($f and true); $a ? $b : $c ? $d : $e ? $f : $g; $a ? $b : ($c ? $d : ($e ? $f : $g)); $a ? $b ? $c : $d : $f; $a ?? $b ?? $c; ($a ?? $b) ?? $c; $a ?? ($b ? $c : $d); $a || ($b ?? $c); (1 > 0) > (1 < 0); ++$a + $b; $a + $b++; $a ** $b ** $c; ($a ** $b) ** $c; -1 ** 2; yield from $a and yield from $b; yield from ($a and yield from $b); // The following will currently add unnecessary parentheses, because the pretty printer is not aware that assignment // and incdec only work on variables. !($a = $b); (++$a) ** $b; $a ** ($b++);