<?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";
preferences:
38.02 ms | 402 KiB | 5 Q