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run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = 0x80; // 128 base 10 var_dump($a); var_dump(base_convert($a, 10, 2)); // not base_convert($a, 16, 2) $b = ~$a; // -128 - 1 == -129 base 10 var_dump(base_convert($b, 10, 2), $b);// not base_convert($b, 16,2); can base_convert handle negative values? 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
int(128) string(8) "10000000" string(8) "10000001" int(-129) 1111111111111111111111111111111111111111111111111111111101111111