Qiniu_Pro/qiniu/services/blockchain/bsc/helper.php

<?php
//gmp extension required

function hex($str, $prefix = true)
{
    $bn = gmp_init($str);
    $ret = gmp_strval($bn, 16);
    return $prefix ? '0x' . $ret : $ret;
}

function bn($n)
{
    return new phpseclib\Math\BigInteger($n);
}