PHP's htmlentities in JavaScript

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

module.exports = function htmlentities (string, quoteStyle, charset, doubleEncode) {
// discuss at:
// original by: Kevin van Zonneveld (
// revised by: Kevin van Zonneveld (
// revised by: Kevin van Zonneveld (
// improved by: nobbler
// improved by: Jack
// improved by: Rafał Kukawski (
// improved by: Dj (
// bugfixed by: Onno Marsman (
// bugfixed by: Brett Zamir (
// input by: Ratheous
// note 1: function is compatible with PHP 5.2 and older
// example 1: htmlentities('Kevin & van Zonneveld')
// returns 1: 'Kevin & van Zonneveld'
// example 2: htmlentities("foo'bar","ENT_QUOTES")
// returns 2: 'foo'bar'
const getHtmlTranslationTable = require('../strings/get_html_translation_table')
const hashMap = getHtmlTranslationTable('HTML_ENTITIES', quoteStyle)
string = string === null ? '' : string + ''
if (!hashMap) {
return false
if (quoteStyle && quoteStyle === 'ENT_QUOTES') {
hashMap["'"] = '''
doubleEncode = doubleEncode === null || !!doubleEncode
const regex = new RegExp('&(?:#\\d+|#x[\\da-f]+|[a-zA-Z][\\da-z]*);|[' +
// replace regexp special chars
.replace(/([()[\]{}\-.*+?^$|/\\])/g, '\\$1') + ']',
return string.replace(regex, function (ent) {
if (ent.length > 1) {
return doubleEncode ? hashMap['&'] + ent.substr(1) : ent
return hashMap[ent]
[ 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/strings/htmlentities'). You could also require the strings module in full so that you could access strings.htmlentities 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.


  • function is compatible with PHP 5.2 and older


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
1htmlentities('Kevin & van Zonneveld')'Kevin & van Zonneveld'

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