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run code in 150+ php & hhvm versions
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<?php $a = 0x80; var_dump(base_convert($a, 16, 2),$a); $b = ~$a; var_dump(base_convert($b, 16, 2), $b); printf("%b", $b); echo "\n";
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(9) "100101000" int(128) string(9) "100101001" int(-129) 1111111111111111111111111111111111111111111111111111111101111111