PHP's htmlentities in JavaScript

How to use

You you can install via yarn add locutus and require this function via const htmlentities = require('locutus/php/strings/htmlentities').

It is important to use a bundler that supports tree-shaking so that you only ship the functions that you actually use to your browser, instead of all of Locutus, which is massive. Examples are: Parcel, webpack, or rollup.js. For server-side use this is typically less of a concern.

Examples

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

#	code	expected result
1	htmlentities('Kevin & van Zonneveld')	'Kevin & van Zonneveld'
2	htmlentities("foo'bar","ENT_QUOTES")	'foo'bar'

Notes

• function is compatible with PHP 5.2 and older

Dependencies

This function uses the following Locutus functions:

• get_html_translation_table (php/strings)

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

module.exports = function htmlentities(string, quoteStyle, charset, doubleEncode) {
  //      discuss at: https://locutus.io/php/htmlentities/
  // parity verified: PHP 8.3
  //     original by: Kevin van Zonneveld (https://kvz.io)
  //      revised by: Kevin van Zonneveld (https://kvz.io)
  //      revised by: Kevin van Zonneveld (https://kvz.io)
  //     improved by: nobbler
  //     improved by: Jack
  //     improved by: Rafał Kukawski (https://blog.kukawski.pl)
  //     improved by: Dj (https://locutus.io/php/htmlentities:425#comment_134018)
  //     bugfixed by: Onno Marsman (https://twitter.com/onnomarsman)
  //     bugfixed by: Brett Zamir (https://brett-zamir.me)
  //        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]*);|[' +
      Object.keys(hashMap)
        .join('')
        // replace regexp special chars
        .replace(/([()[\]{}\-.*+?^$|/\\])/g, '\\$1') +
      ']',
    'g',
  )

  return string.replace(regex, function (ent) {
    if (ent.length > 1) {
      return doubleEncode ? hashMap['&'] + ent.substr(1) : ent
    }

    return hashMap[ent]
  })
}

Think you can do better?

Not unlike Wikipedia, Locutus is an ongoing community effort. Our philosophy follows The McDonald’s Theory. This means that we assimilate first iterations with imperfections, hoping for others to take issue with-and improve them. This unorthodox approach has worked very well to foster fun and fruitful collaboration, but please be reminded to use our creations at your own risk. THE SOFTWARE IS PROVIDED "AS IS" has never been more true than for Locutus.

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