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run code in 200+ php & hhvm versions
Bugs & Features
<?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 - 7.2.0
string(9) "100101000" int(128) string(9) "100101000" int(-128) 1111111111111111111111111111111111111111111111111111111110000000