PHP's ini_set in JavaScript

Here’s what our current JavaScript equivalent to PHP's ini_set looks like.

module.exports = function ini_set (varname, newvalue) { // eslint-disable-line camelcase
// discuss at:
// original by: Brett Zamir (
// note 1: This will not set a global_value or access level for the ini item
// example 1: ini_set('date.timezone', 'Asia/Hong_Kong')
// example 1: ini_set('date.timezone', 'America/Chicago')
// returns 1: 'Asia/Hong_Kong'
const $global = (typeof window !== 'undefined' ? window : global)
$global.$locutus = $global.$locutus || {}
const $locutus = $global.$locutus
$locutus.php = $locutus.php || {}
$locutus.php.ini = $locutus.php.ini || {}
$locutus.php.ini = $locutus.php.ini || {}
$locutus.php.ini[varname] = $locutus.php.ini[varname] || {}
const oldval = $locutus.php.ini[varname].local_value
const lowerStr = (newvalue + '').toLowerCase().trim()
if (newvalue === true || lowerStr === 'on' || lowerStr === '1') {
newvalue = 'on'
if (newvalue === false || lowerStr === 'off' || lowerStr === '0') {
newvalue = 'off'
const _setArr = function (oldval) {
// Although these are set individually, they are all accumulated
if (typeof oldval === 'undefined') {
$locutus.ini[varname].local_value = []
switch (varname) {
case 'extension':
_setArr(oldval, newvalue)
$locutus.php.ini[varname].local_value = newvalue
return oldval
[ View on GitHub | Edit on GitHub | Source on GitHub ]

How to use

You you can install via npm install locutus and require it via require('locutus/php/info/ini_set'). You could also require the info module in full so that you could access info.ini_set instead.

If you intend to target the browser, you can then use a module bundler such as Parcel, webpack, Browserify, or rollup.js. This can be important because Locutus allows modern JavaScript in the source files, meaning it may not work in all browsers without a build/transpile step. Locutus does transpile all functions to ES5 before publishing to npm.

A community effort

Not unlike Wikipedia, Locutus is an ongoing community effort. Our philosophy follows The McDonald’s Theory. This means that we don't consider it to be a bad thing that many of our functions are first iterations, which may still have their fair share of issues. We hope that these flaws will inspire others to come up with better ideas.

This way of working also means that we don't offer any production guarantees, and recommend to use Locutus inspiration and learning purposes only.


  • This will not set a global_value or access level for the ini item


Please note that these examples are distilled from test cases that automatically verify our functions still work correctly. This could explain some quirky ones.

#codeexpected result
1ini_set('date.timezone', 'Asia/Hong_Kong') ini_set('date.timezone', 'America/Chicago')'Asia/Hong_Kong'

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