Função do PHP uniqid em SQL e JS

uniqid.js

// http://locutus.io/php/misc/uniqid/
function uniqid (prefix, moreEntropy) => {
  if (typeof prefix === 'undefined') {
    prefix = '';
  }

  let retId;
  const _formatSeed = function (seed, reqWidth) {
    seed = parseInt(seed, 10).toString(16); // to hex str
    if (reqWidth < seed.length) {
      // so long we split
      return seed.slice(seed.length - reqWidth);
    }
    if (reqWidth > seed.length) {
      // so short we pad
      return new Array(1 + (reqWidth - seed.length)).join('0') + seed
    }
    return seed;
  };

  let $global = (typeof window !== 'undefined' ? window : global);
  $global.$locutus = $global.$locutus || {};
  let $locutus = $global.$locutus;
  $locutus.php = $locutus.php || {};

  if (!$locutus.php.uniqidSeed) {
    // init seed with big random int
    $locutus.php.uniqidSeed = Math.floor(Math.random() * 0x75bcd15);
  }
  $locutus.php.uniqidSeed++;

  // start with prefix, add current milliseconds hex string
  retId = prefix;
  retId += _formatSeed(parseInt(new Date().getTime() / 1000, 10), 8);
  // add seed hex string
  retId += _formatSeed($locutus.php.uniqidSeed, 5);
  if (moreEntropy) {
    // for more entropy we add a float lower to 10
    retId += (Math.random() * 10).toFixed(8).toString();
  }

  return retId
}

uniqid.sql

# TODO: add prefix and moreEntropy
CREATE FUNCTION `uniqid`()
  RETURNS VARCHAR(13)
BEGIN

RETURN concat(
	lower(substring(hex(floor(UNIX_TIMESTAMP(NOW(2))*1000)), 1, 8)),
	lower(substring(hex((floor(rand() * 0x75bcd15))), 1, 5))
);
END