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$start = $a;
$end = ++$a;
for ($_ = $start; $_ <= $end; $_++) { ... }

for (++$x .. $x++ . $x) { ... }
# starting at ++$x
# ending at $x++ . $x
# THE END HAS MODIFIED THE START

print ++$x, ++$x, ++$x;  # 333

$x = 3;
print ++$x/$x--;  # 3/4 => 0.75

for (++$x .. $x++ . $x--) { ... }
# or
for (++$....$.++.$.--) { ... }