- var_dump: documentation ( source)
- base_convert: documentation ( source)
- printf: documentation ( source)
<?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";