<?php
function dechex_size($val, $size) {
if ($size < 1) {
error_log("Invalid value for $size");
return false;
}
$bits = $size << 2;
if ($bits > log(PHP_INT_MAX, 2)) {
return dechex($val);
}
$mask = 0;
for ($i = 0; $i < $size; ++$i) {
$mask = ($mask << 4) | 0xF;
}
$val &= $mask;
return sprintf("%x", $val);
}
echo dechex_size(15,4), "\n"; // gives 000f
echo dechex_size(-1,16), "\n"; // gives ffffffffffffffff
echo dechex_size(-1,2), "\n"; // gives ff
echo dechex_size(1025,2), "\n"; // gives ? (either 401, 01, ff, or false)
- Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
- f
ffffffffffffffff
ff
1
preferences:
218.32 ms | 403 KiB | 287 Q