in encode/php/src/EncodeUtil.php [68:82]
public static function hexEncode($raw)
{
if (empty($raw)) {
throw new \InvalidArgumentException('not a valid value for parameter');
}
$ret = '';
foreach ($raw as $i => $b) {
$str = dechex($b);
if (strlen($str) < 2) {
$str = str_pad($str, 2, '0', STR_PAD_LEFT);
}
$ret .= $str;
}
return $ret;
}