locutus/esm/php/misc/uniqid.js

Locutus other languages' standard libraries to JavaScript for fun and educational purposes

import { getPhpRuntimeNumber, setPhpRuntimeEntry } from "../_helpers/_phpRuntimeState.js";
export function uniqid(prefix, moreEntropy) {
    //  discuss at: https://locutus.io/php/uniqid/
    // original by: Kevin van Zonneveld (https://kvz.io)
    //  revised by: Kankrelune (https://www.webfaktory.info/)
    //      note 1: Uses an internal counter (in locutus global) to avoid collision
    //   example 1: var $id = uniqid()
    //   example 1: var $result = $id.length === 13
    //   returns 1: true
    //   example 2: var $id = uniqid('foo')
    //   example 2: var $result = $id.length === (13 + 'foo'.length)
    //   returns 2: true
    //   example 3: var $id = uniqid('bar', true)
    //   example 3: var $result = $id.length === (23 + 'bar'.length)
    //   returns 3: true
    const normalizedPrefix = prefix ?? '';
    let retId = '';
    const formatSeed = (seed, reqWidth) => {
        const hexSeed = Number.parseInt(String(seed), 10).toString(16); // to hex str
        if (reqWidth < hexSeed.length) {
            // so long we split
            return hexSeed.slice(hexSeed.length - reqWidth);
        }
        if (reqWidth > hexSeed.length) {
            // so short we pad
            return new Array(1 + (reqWidth - hexSeed.length)).join('0') + hexSeed;
        }
        return hexSeed;
    };
    let uniqidSeed = getPhpRuntimeNumber('uniqidSeed', Math.floor(Math.random() * 0x75bcd15)); // init seed with big random int
    uniqidSeed++;
    setPhpRuntimeEntry('uniqidSeed', uniqidSeed);
    // start with prefix, add current milliseconds hex string
    retId = normalizedPrefix;
    retId += formatSeed(Number.parseInt(String(new Date().getTime() / 1000), 10), 8);
    // add seed hex string
    retId += formatSeed(uniqidSeed, 5);
    if (moreEntropy) {
        // for more entropy we add a float lower to 10
        retId += (Math.random() * 10).toFixed(8).toString();
    }
    return retId;
}