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run code in 150+ php & hhvm versions
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<?php echo dechex(~256 + 1); var_dump(dechex(256)); var_dump(dechex(-256));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
ffffffffffffff00string(3) "100" string(16) "ffffffffffffff00"