PHP's assert_options in JavaScript

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

module.exports = function assert_options (what, value) { // eslint-disable-line camelcase
// discuss at:
// original by: Brett Zamir (
// example 1: assert_options('ASSERT_CALLBACK')
// returns 1: null
let iniKey, defaultVal
switch (what) {
iniKey = ''
defaultVal = 1
iniKey = 'assert.warning'
defaultVal = 1
var msg = 'We have not yet implemented warnings for us to throw '
msg += 'in JavaScript (assert_options())'
throw new Error(msg)
iniKey = 'assert.bail'
defaultVal = 0
iniKey = 'assert.quiet_eval'
defaultVal = 0
iniKey = 'assert.callback'
defaultVal = null
throw new Error('Improper type for assert_options()')
// I presume this is to be the most recent value, instead of the default value
const iniVal = (typeof require !== 'undefined' ? require('../info/ini_get')(iniKey) : undefined) || defaultVal
return iniVal
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How to use

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


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

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