snowflake_helper.php

<?php
//uses discord snowflake as a parameter
function snowflake_timestamp(string $snowflake)
{
    if (\PHP_INT_SIZE === 4) { //x86
        $binary = \str_pad(\base_convert($snowflake, 10, 2), 64, 0, \STR_PAD_LEFT);
        $time = \base_convert(\substr($binary, 0, 42), 2, 10);
        $timestamp = (float) ((((int) \substr($time, 0, -3)) + 1420070400).'.'.\substr($time, -3));
        $workerID = (int) \base_convert(\substr($binary, 42, 5), 2, 10);
        $processID = (int) \base_convert(\substr($binary, 47, 5), 2, 10);
        $increment = (int) \base_convert(\substr($binary, 52, 12), 2, 10);
    } else { //x64
        $snowflake = (int) $snowflake;
        $time = (string) ($snowflake >> 22);
        $timestamp = (float) ((((int) \substr($time, 0, -3)) + 1420070400).'.'.\substr($time, -3));
        $workerID = ($snowflake & 0x3E0000) >> 17;
        $processID = ($snowflake & 0x1F000) >> 12;
        $increment = ($snowflake & 0xFFF);
    }
    if ($timestamp < 1420070400 || $workerID < 0 || $workerID >= 32 || $processID < 0 || $processID >= 32 || $increment < 0 || $increment >= 4096) {
        return null;
    }

    return $timestamp;
}