<?php $a = 0x40; // equivalent decimal value assigned to $a var_dump($a); // 64 in base 10 var_dump(base_convert($a, 10, 2)); // not base_convert($a, 16, 2) == 2 ** 6 or 1000000 $b = ~$a; // flip bits, i.e. 2s complement so -$a and then minus 1 var_dump($b); // -65 var_dump(base_convert($b, 10, 2), $b);// not base_convert($b, 16,2); but base_convert can't handle negative values! printf("%b", $b); // decimal 65 expressed in binary echo "\n\n";
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